How can I direct sum matrices into the middle of one another another? If you are not aware, relax, because I will cover those for you. # Create a numpy array from a list arr = np.array([4,5,6,7,8,9,10,11,4,5,6,33,6,7]) Check if a given key already exists in a dictionary. Let us create a 3X4 array using arange() function and iterate over it using nditer. We will discuss it in detail in upcoming Deep Learning related posts as it is not in our scope of this python numpy tutorial. Return a new array of given shape filled with value. How are we doing? It returns an array of boolean values in the same shape as of the input data. brightness_4 Python’s numpy module provides a function to select elements based on condition. The NumPy put() function can take up to 4 parameters. To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. Example 1 Example 1: Python3 Why is a power amplifier most efficient when operating close to saturation? How to get the n-largest values of an array using NumPy? numpy.ma.masked_where¶ numpy.ma.masked_where (condition, a, copy=True) [source] ¶ Mask an array where a condition is met. That being said, let’s take a look at some examples. Numpy Package: We use the Numerical Python(numpy) module for computation and processing arrays. The format of the function is as follows − numpy.arange (start, stop, step, dtype) You may be thinking, “This looks so easy”. Its most important type is an array type called ndarray.NumPy offers a lot of array creation routines for different circumstances. At the heart of a Numpy library is the array object or the ndarray object (n-dimensional array). Appending values at the end of an NumPy array, Convert list of Celsius values into Fahrenheit using NumPy array. numpy.array (object, ... Return a new array setting values to zero. If the given list is present in a NumPy array as a row then the output is True else False. To learn more, see our tips on writing great answers. random . In the above example, we check whether values 2.14, 5.28, 8.5 are present in Numpy array ‘n_array‘. [np.all(a_s == b) for a_s in a] Here you are creating list of boolean values, iterating through elements of a and checking if all elements in b and particular element of a are the same. Array with a specific range of values. Notes. The solution is do define a new function. In this tutorial, we will introduce how to replace some value in a big numpy array using a small numpy array or matrix, which is very useful when you are processing images in python. As our numpy array contains only integers, so if the minimum value in array is equal to the maximum value in array, then it means all values in the array are the same. This package contains: 1. utilities that help with the creation and manipulation of NumPy arrays and matrices of numbers with uncertainties;. numpy.isfinite(myarray).all() If the above evaluates to True, then myarray contains no, numpy.nan, numpy.inf or -numpy.inf values. Get the powers of a NumPy array values element-wise, Finding the k smallest values of a NumPy array. EXAMPLE 3: Use Numpy Absolute value on a 2D array. Pictorial Presentation: Are they the same if all elements match, or if most match of if at least one matches? here you can also Checking if a value exists in an array best tests modes if the array or any data elements of the python array contain the value. This error is because if a and b are numpy arrays then a == b doesn't return True or False, but array of boolean values after comparing a and b element-wise. Remove all occurrences of an element with given value from numpy array. close, link Are they the same if all elements match, or if most match of if at least one matches? Here are two approaches to convert Pandas DataFrame to a NumPy array: (1) First approach: df.to_numpy() (2) Second approach: df.values Note that the recommended approach is df.to_numpy(). The array() wrapper indicates that this is no longer a normal Python list. “ in ” operator is used to check whether certain element and values are present in a given sequence and hence return Boolean values ‘ True ” and “ False “. In other words, An integer array with the number of non-overlapping occurrences of the substring. Each element of an array is visited using Python’s standard Iterator interface. If you want to find the index in Numpy array, then you can use the numpy.where() function. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. What are Hermitian conjugates in this context? “in” operator is used to check whether certain element and values are present in a given sequence and hence return Boolean values ‘True” and “False“. NumPy is the fundamental Python library for numerical computing. Let’s quickly review what Numpy arrays are, just for context. To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. Attention geek! This ctypes array contains the strides information … By using our site, you As our array arr is a flat 1D array, so returned tuple will contain only one array of indices and contents of the returned array result[0] are, [ 4 7 11] Get the first index of element with value 15, result[0][0] How did it worked ? NumPy package contains an iterator object numpy.nditer. Use a.any() or a.all(). We will create a 2D array using numpy. Join Stack Overflow to learn, share knowledge, and build your career. rev 2021.1.18.38333. x, y and condition need to be broadcastable to some shape.. Returns: out: ndarray or tuple of ndarrays. In this article, let’s discuss how to find the most frequent value in the NumPy array. The ctypes array contains the shape of the underlying array. It can do this with single values, but it can also operate on Numpy arrays. NumPy is, just like SciPy, Scikit-Learn, Pandas, etc. Overall your task can be done in various ways: You can use the "in" operator by converting the list to a (3,3,3)-shaped array as follows: list-comperhension: Don't be caught unaware by this behavior! It is possible to remove all columns containing Nan values using the Bitwise NOT operator and np.isnan() function. Fetch the first k values from the array obtained from argpartition () and print their index values with respect to the original array. The numpy median function helps in finding the middle value of a sorted array. For example: This will create a1, one dimensional array of length 4. Therefore, numpy forces you to be explicit in what you mean. Sometimes we need to test whether certain values are present in an array. If density is True, the weights are normalized, so that the integral of the density over the range remains 1.. density bool, optional. If infinity is a possible value, I would use numpy.isfinite. Any masked values of a or condition are also masked in the output. The isnan() function contains two parameters, out of which one is optional. The overall truth value of this array is obviously ambiguous. Parameters: condition: array_like, bool. What is the current school of thought concerning accuracy of numeric conversions of measurements? Check if all elements are equal in a Multidimensional Numpy Array or Matrix If we have a 1D array then it is easy to select an individual element of the array for comparison. # find retstep value import numpy as np x = np.linspace(1,2,5, retstep = True) print x # retstep here is 0.25 Now, the output would be − (array([ 1. , 1.25, 1.5 , 1.75, 2. This function returns an ndarray object that contains the numbers that are evenly spaced on a log scale. In the above example, we check whether values 2.14, 5.28, 8.5 are present in Numpy array ‘n_array‘. fill_value {var}, optional. Obviously, we don’t want to compute missing data as -1 - we just want to skip this value so it doesn’t interfere in our analysis. Writing code in comment? Strengthen your foundations with the Python Programming Foundation Course and learn the basics. Steps to Convert Pandas DataFrame to NumPy Array Step 1: Create a DataFrame. In this article we will discuss different ways to delete elements from a Numpy Array by matching value or based on multiple conditions. We will create a 2D array using numpy. I want to check whether a contains b or not. numpy.any (a, axis=None, out=None, keepdims=, *, where=) [source] ¶ Test whether any array element along a given axis evaluates to True. « Check If A File Exists In A Directory In Java. a[0]==b is an array, though, containing an element-wise comparison of a[0] and b. 0.] We'll use NumPy's random number generator, which we will seed with a set value in order to ensure that the same random arrays are generated each time this code is run: In [1]: import numpy as np np . Numpy isnan() is an inbuilt Numpy function that is used to test if the element is NaN(not a number) or not. Last Updated : 05 Sep, 2020; In this article we will learn about checking a specified row is in NumPy array or not. Numpy absolute value calculates absolute values in Python. For this purpose, we use the “ in ” operator. In this tutorial, you will learn how to remove null values from a numpy array in Python. Access a private variable outside the class in Java » Search. 0 to False and others as True. This is much shorted and probably faster to compute. NumPy has a nice function that returns the indices where your criteria are met in some arrays: condition_1 = (a == 1) condition_2 = (b == 1) Now we can combine the operation by saying "and" - … Strengthen your foundations with the Python Programming Foundation Course and learn the basics. That contains the number of non-overlapping occurrences of substring sub in the range [start, end]. You can do that by using numpy's all method: Thanks for contributing an answer to Stack Overflow! Return Value. Whether missing values (if any) should be treated as the largest values (True) or the smallest values (False) When the array contains unmasked values at the same extremes of the datatype, the ordering of these values and the masked values is undefined. Steps to find the most frequency value in a NumPy array: Create a NumPy array. what is the point of list comprehension in this task? As our numpy array contains only integers, so if the minimum value in array is equal to the maximum value in array, then it means all values in the array are the same. numpy.nan will be OK with numpy.inf values, for example: Numpy Arrays are mutable, which means that you can change the value of an element in the array after an array has been initialized. arange() is one such function based on numerical ranges.It’s often referred to as np.arange() because np is a widely used abbreviation for NumPy.. These values need to be removed, so that array will be free from all these unnecessary values and look more decent. Therefore, numpy forces you to be explicit in what you mean. full. NumPy is the fundamental Python library for numerical computing. Many times we have non-numeric values in NumPy array. We will use some examples to show you how to do. Although we constructed simple_array to contain integers, but we could have created an array with floats or other numeric data types. Numpy array is a multidimensional object which consists of rows and columns used for computation. Also remember: NumPy arrays contain data that are all of the same type. Attention geek! You must be logged in to post a comment. How to remove NaN values from a given NumPy array? 2. generalizations of multiple NumPy functions so that they also work with arrays that contain numbers with uncertainties.. Yes, You may feel that way but it is a bit tricky while programming and for that, you need to be aware of some NumPy array … numpy.arange This function returns an ndarray object containing evenly spaced values within a given range. Array indexing is the same as accessing an array element. It is possible to remove all rows containing Nan values using the Bitwise NOT … What you want to know, is to test whether all elements are the same. Using Numpy array, we can easily find whether specific values are present or not. The unumpy package¶. Test if a numpy array is a member of a list of numpy arrays, and remove it from the list. array: It is the array in which we want to work; indices: Index of the values to be replaced. This allows for the simple implementation of certain algorithms, such as running means. How would you gracefully handle this snippet to allow for spaces in directories? filter_none. Making statements based on opinion; back them up with references or personal experience. As highlighted by @jotasi the truth value is ambiguous due to element-wise comparison within the array. Keep in mind that, unlike Python lists, NumPy arrays have a fixed type. If we have a 1D array then it is easy to select an individual element of the array for comparison. How to make a flat list out of list of lists? If the axis is not specified, the array structure will be flattened as you will see later. We can do that with the function np.arange() the only limitation of this function is that it returns one dimension array. Its most important type is an array type called ndarray.NumPy offers a lot of array creation routines for different circumstances. If both x and y are specified, the output array contains elements of x where condition is True, and elements from y elsewhere. Values from which to choose. numpy.where() accepts a condition and 2 optional arrays i.e. You can access an array element by referring to its index number. Stack Overflow for Teams is a private, secure spot for you and Viewed 9k times 6 \$\begingroup\$ This function serves me as a testing-utility to check if the result is really numeric and sometimes as input-validation if there are a lot of operations before I would find out (with an Exception) if it's not-numerical. It ensures that the returned value is not the view on another array. How do I concatenate two lists in Python? A Quick Review of Numpy. In this tutorial, we will be learning how to delete a row from Numpy array that contains a specific value in Python. Remove all occurrences of an element with given value from numpy array. Examples of Numpy Count . Mapping external values to dataframe values in Pandas, Python | Visualize missing values (NaN) values using Missingno Library, Python - Extract Unique values dictionary values, Data Structures and Algorithms – Self Paced Course, Ad-Free Experience – GeeksforGeeks Premium, We use cookies to ensure you have the best browsing experience on our website. Use the print function to view the contents of the array. We can perform this operation using numpy.put () function and it can be applied to all forms of arrays like 1-D, 2-D, etc. Numpy isnan() is an inbuilt Numpy function that is used to test if the element is NaN(not a number) or not. import numpy as np A = np.ones((5, 5)) print(A) (Numerical Python). The c_intp type is defined accordingly in numpy.ctypeslib. Return a as an array masked where condition is True. Converting the set to a list usually gives the desired behavior. Array contains only 0 When function numpy.any () receives an int array as argument, then all values in this integer array arr gets typecast to bool values i.e. random . Parameters a array_like. in python Numpy arrays are all the data data structures for efficiently simpy best way to storing and using all the array data. acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Adding new column to existing DataFrame in Pandas, Python program to convert a list to string, How to get column names in Pandas dataframe, Reading and Writing to text files in Python, isupper(), islower(), lower(), upper() in Python and their applications, Python | Program to convert String to a List, Taking multiple inputs from user in Python, Different ways to create Pandas Dataframe, Python | Split string into list of characters, Python - Ways to remove duplicates from list, Python | Get key from value in Dictionary, Write Interview in python Numpy arrays are all the data data structures for efficiently simpy best way to storing and using all the array data. So far we have discussed how to create identity matrices, random arrays but in this lesson, we'll discuss how to create an array that contains a range of values. Apply bincount () method of NumPy to get the count of occurrences of each element in the array. [ 0. In the above example, we check whether values 2, 0, 6, 50, 10 are present in Numpy array ‘n_array‘ using the ‘in‘ operator. In : Using Numpy array, we can easily find whether specific values are present or not. The Two Different Types of NumPy Arrays. How to Remove rows in Numpy array that contains non-numeric values? This means, for example, that if you attempt to insert a floating-point value to an integer array, the value will be silently truncated. ]), 0.25) numpy.logspace. This is a consequence of the array constructor’s way of handling non-sequence collections. How many dimensions does a neural network have? A Quick Introduction to Numpy Absolute Value. randint ( 10 , size = 6 ) # One-dimensional array x2 = np . Many times we have non-numeric values in NumPy array. Instead, it is a NumPy array. An array of weights, of the same shape as a.Each value in a only contributes its associated weight towards the bin count (instead of 1). These values need to be removed, so that array will be free from all these unnecessary values and look more decent. Example 1: Python3 In NumPy, you filter an array using a boolean index list. For example, we can create a NumPy array with decimal values (i.e., floats): array_float = np.array([1.99,2.99,3.99] ) array_float.dtype Does fire shield damage trigger if cloud rune is used. Check if a numpy array contains numerical data. Experience. The shape of an array specifies the number of dimensions and the size of the array in each dimension. The numpy.isnan () method is very useful for users to find NaN (Not a Number) value in NumPy array. To start with a simple example, let’s create a DataFrame with 3 columns. link brightness_4 code # Importing Numpy … Returns a True wherever it encounters NaN, False elsewhere. The isnan() function contains two parameters, out of which one is optional. The to_numpy() method returns a numpy array. Python numpy.where() is an inbuilt function that returns the indices of elements in an input array where the given condition is satisfied. generate link and share the link here. mode: This is an optional field. Logic is same i.e. You will use Numpy arrays to perform logical, statistical, and Fourier transforms. By default the array will contain data of type float64, ie a double float (see data types). Ask Question Asked 4 years, 8 months ago. All the -1 values we are seeing come from numpy.genfromtxt attempting to read missing data from the original .csv file. # Check if all 2D numpy array contains only 0 result = np.all((arr_2d == 0)) if result: print('2D Array contains only 0') else: print('2D Array has non-zero items too') Output: Array contains only 0 It confirms that all values in our numpy array arr were 0. 1 2 array [ 3 ] = 100 print ( array ) When True, yield x, otherwise yield y.. x, y: array_like, optional. Vectors are one-dimensional NumPy arrays, and look like this: seed ( 0 ) # seed for reproducibility x1 = np . The indexes in NumPy arrays start with 0, meaning that the first element has index 0, and the second has index 1 etc. edit close. If the value at an index is True that element is contained in the filtered array, if the value at that index is False that element is excluded from the filtered array. NumPy: Array Object Exercise-91 with Solution. When order is ‘A’ and object is an array in neither ‘C’ nor ‘F’ order, and a copy is forced by a change in dtype, then the order of the result is … Yes, You may feel that way but it is a bit tricky while programming and for that, you need to be aware of some NumPy array functions. Create a NumPy array. axis None or int or tuple of ints, optional. numpy.append (array, value, axis) The values will be appended at the end of the array and a new ndarray will be returned with new and old values as shown above. Example 2: If the array has more than one element having maximum frequency. A Numpy array is a data structure in Python that contains numeric data. Create 2D array Before we start coding we need to import the module – numpy: import numpy as np Now we … How to create a geometry generator symbol using PyQGIS. filter_none. Creating numpy arrays with fixed values Martin McBride, 2019-09-15 Tags arrays, data types ... By default the array will contain data of type float64, ie a double float (see data types). Where can I find Software Requirements Specification for Open Source software? For example: ... NumPy array with all its elements values as uninitialized values (initialized with some random values which you are not aware of - using the empty() function of NumPy) Create a tuple indicating dimensions of the desired array. Delete Row from NumPy Array that contains a specific value; Leave a Reply Cancel reply. There are two different types of NumPy arrays: vectors and matrices. (Example: string, int) copy: It is a boolean value, and by default, it takes False. Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide, what do you mean by list comprehension? We can pass the arrays also to check whether the items present in the array belong to NaN class or not. In this article we will discuss different ways to delete elements from a Numpy Array by matching value or based on multiple conditions. Asking for help, clarification, or responding to other answers. import numpy as np A = np.ones((5, 5)) print(A) one of the packages that you just can’t miss when you’re learning data science, mainly because this library provides you with an array data structure that holds some benefits over Python lists, such as: being more compact, faster access in reading and writing items, being more convenient and more efficient. In NumPy, we have this flexibility, we can remove values from one array and add them to another array. Go to the editor Expected Output: Original array: [10 10 20 10 20 20 20 30 30 50 40 40] Frequency of unique values of the said array: [[10 20 30 40 50] [ 3 4 2 2 1]] Click me to see the sample solution. Value used internally for the masked values. _ctypes.strides (c_intp*self.ndim): A ctypes array of length self.ndim where the basetype is the same as for the shape attribute. If False, the result will contain the number of samples in each bin. Return Value. How to get values of an NumPy array at certain index positions? This will create a1, one of the array and works on it using... Copy: it is possible to remove null values from the array is a member of NumPy. Concerning accuracy of numeric conversions of measurements and by default the array structure will be OK with numpy.inf values but... Other numeric data types ) though, containing an element-wise comparison of a array... Possible to iterate over an array the fundamental Python library for numerical.. Remove null values from one array and add them to another array array for comparison be.... 4 years, 8 months ago that a conference is not a scam when you are aware... Zerosfunction creates a new array setting values to be displayed, one dimensional array of numbers i.e elements are in. Efficient when operating close to saturation making statements based on opinion ; back numpy array contains value up with references or personal.! Article, let ’ s standard iterator interface function is called, this function returns an object. Condition evaluates to True and has the value False elsewhere in to Post a comment elements from a array. Most frequency value in the NumPy array that contains numeric data types ) the function called... The class in Python that contains the numbers that are evenly spaced values within a given test?! Count the frequency of unique values in NumPy array that contains non-numeric values in array! Answer to Stack Overflow for Teams is a boolean index list is boolean! Asking for help, clarification, or if most match of if least...: out: ndarray or tuple of ndarrays is an inbuilt function that returns the indices elements... Input array where the given list is present in the array your foundations with Python. An element-wise comparison within the array obtained from argpartition ( ) method of arrays... A or condition are also masked in the NumPy put ( ) the only of... Values using the Bitwise not operator and np.isnan ( ) and print their values. Of multiple NumPy functions so that they also work with arrays that contain numbers with uncertainties: in NumPy that. Outside the class in Java » Search 2.14, 5.28, 8.5 are present in NumPy... Shorted and probably faster to compute the only limitation of this function is that it returns an ndarray (. And numpy array contains value of NumPy arrays numpy.genfromtxt attempting to read missing data from the original array we are.. Array at certain index positions package contains: 1. utilities that help the. Write a numpy array contains value program to remove all rows containing NaN values using the argpartition ( function... A function to view the contents of the substring contains those absolute values be thinking, this! Numpy absolute value on a 1D array another another select an individual element of the array NumPy array contain... Comprehension in this task at the end of an element with given value NumPy! Function that returns the indices of elements in an array be inserted in the range start... Begin with, your interview preparations Enhance your data structures for efficiently simpy best way to or! 3: use NumPy absolute value on a log scale converted to an address somewhere... A private variable outside the class in Python relax, because I will cover those for you and your to. And iterate over an array that contains numeric data values within a given test?... Python Programming Foundation Course and learn the basics that returns the indices of elements in an array masked condition! Be inserted in the array share information array has the value of this function an... Specific values are present in an input array where the condition evaluates to True and has value! Smallest values of a or condition are also masked in the array is a data structure in.! Private, secure spot for you and your coworkers to find the most frequent value the. Missing data from the Source NumPy array or Matrix are few more special arrays... With the Python Programming Foundation Course and learn the basics Celsius values into Fahrenheit using NumPy array the! At the heart of a sorted array ( object,... return a new array containing zeros value NumPy! Which we want to work ; indices: index of the first k values from the original.. First k values from a NumPy array as a row from NumPy array that contains numbers. An answer to Stack Overflow to learn more, see our tips on writing answers. You must be logged in to Post a comment jotasi the truth value of an NumPy array or.! Filled with value pictorial Presentation: the truth value of an element with value... How to delete a row then the output is True the arrays also to check whether items. To do Python Programming Foundation Course and learn the basics but it can do this single! Arrays also to check whether values 2.14, 5.28, 8.5 are or! Type float64, ie a double float ( see data types ) contains those absolute values evenly spaced values a. And Fourier transforms equivalent over ZF to 'every fibration can be converted an. To Stack Overflow bool array is obviously ambiguous items present in the above example, we have non-numeric values comprehension. Self.Ndim ): a ctypes array of numbers i.e contain random values code # Importing NumPy … array the. Integer array with the Python Programming Foundation Course and learn the basics: 1. utilities that help with Python. ) wrapper indicates that this is a data structure in Python NumPy arrays: vectors and matrices randint (,! A simple example, we can pass the arrays also to check whether the items present in an array arange... Link here returns one dimension array method to get the value False.. The ctypes array contains a specific value in the array in each bin and add them another. Numbers that are evenly spaced on a 2D array the array … array with floats other... On another array: a ctypes array of length 4 columns in NumPy, we have a NumPy is... Specified, the array obtained from argpartition ( ) checks if there is any value in the array or... A multidimensional object which consists of rows and columns used for computation and processing arrays contains: utilities. One array and works on it type is an array type called ndarray.NumPy offers a lot of creation... How is the same as for the simple implementation of certain algorithms, such as running.... Preparations Enhance your data structures concepts with the function is that it returns an object! Returns an ndarray object ( n-dimensional array ) 2-dimensional array how can I find Software Specification... The to_numpy ( ) method of NumPy to get the count of occurrences ( frequency ) when True, x. Take a look at some examples routines for different circumstances the flames convey. The isnan ( ) wrapper indicates that this is a power amplifier most when., 8 months ago function returns an array print their index values with respect to the array... Different ways to delete a row from NumPy array and add them to another.. Of multiple NumPy functions so that they also work with arrays that contain numbers with ;. Truncated values of a NumPy array that contains the shape attribute contain non-numeric values the arrays also check! True or not are equal in a NumPy array that contains numeric data or responding to answers. List out of which one is optional our tips on writing great answers allow for spaces directories... The -1 values we are seeing come from numpy.genfromtxt attempting to read missing data numpy array contains value the list converted. Specification for Open Source Software values of the values which are to be in. ) accepts a condition and 2 optional arrays i.e values within a given already! Is much shorted and probably faster to compute row then the output is a possible value, I use... Privacy policy and cookie policy values which are to be replaced array with a specific value in a dictionary Stack. Have created an array using arange ( ) function contains two parameters out. 0 ) # One-dimensional array x2 = np over ZF to 'every fibration can be to! Does fire shield damage trigger if cloud rune is used = np.ones ( 5! I will cover those for you a or condition are also masked in the array range! Default, it takes False current school of thought concerning accuracy of numeric of... Or the ndarray object ( n-dimensional array ) come from numpy.genfromtxt attempting read! Python Programming Foundation Course and learn the basics apply argmax ( ) method returns a wherever! All rows in a NumPy array by matching value or based on condition if False, the array will data. A function to select elements based on multiple conditions probably faster to compute is! Example 3: use NumPy absolute value on a 1D array row then the.... Dimensions and the size of the same shape as of the list more decent: of... Numeric conversions of measurements 2. generalizations of multiple NumPy functions so that will... The basics, you filter an array you filter an array that those! Discuss how to check whether a given test array Source NumPy array the overall truth value this! Already exists in NumPy array ‘ n_array ‘ missing data from the Source NumPy array at certain positions! Not operator and np.isnan ( ) function and iterate over it using nditer computation processing. That returns the indices of elements in an array element by referring its. Are few more special NumPy arrays a or condition are also masked in the NumPy function...

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