convert nan value to zero

This should work:

from numpy import *

a = array([[1, 2, 3], [0, 3, NaN]])
where_are_NaNs = isnan(a)
a[where_are_NaNs] = 0

In the above case where_are_NaNs is:

In [12]: where_are_NaNs
Out[12]: 
array([[False, False, False],
       [False, False,  True]], dtype=bool)

Related Posts:

  1. Removing nan values from an array
  2. TypeError: only integer scalar arrays can be converted to a scalar index with 1D numpy indices array
  3. Import Error: No module named numpy
  4. numpy max vs amax vs maximum
  5. Difference between import numpy and import numpy as np
  6. What is the purpose of meshgrid in Python / NumPy?
  7. why numpy.ndarray is object is not callable in my simple for python loop
  8. numpy division with RuntimeWarning: invalid value encountered in double_scalars
  9. How do I create an empty array/matrix in NumPy?
  10. Most efficient way to find mode in numpy array
  11. numpy division with RuntimeWarning: invalid value encountered in double_scalars
  12. numpy matrix vector multiplication
  13. Converting list to numpy array
  14. How do I read CSV data into a record array in NumPy?
  15. How to replace NaN values by Zeroes in a column of a Pandas Dataframe?
  16. How do you do natural logs (e.g. “ln()”) with numpy in Python?
  17. How do I read CSV data into a record array in NumPy?
  18. How to normalize a NumPy array to a unit vector?
  19. ImportError: numpy.core.multiarray failed to import
  20. Factorial in numpy and scipy
  21. ImportError: numpy.core.multiarray failed to import
  22. size of NumPy array
  23. numpy array concatenate: “ValueError: all the input arrays must have same number of dimensions”
  24. Convert a tensor to numpy array in Tensorflow?
  25. Use a.any() or a.all()
  26. ‘DataFrame’ object has no attribute ‘sort’
  27. ‘End of statement expected’ in pycharm
  28. Most efficient way to map function over numpy array
  29. Is there a NumPy function to return the first index of something in an array?
  30. initialize a numpy array
  31. TypeError: ‘DataFrame’ object is not callable
  32. Cannot convert list to array: ValueError: only one element tensors can be converted to Python scalars
  33. How can I use numpy.correlate to do autocorrelation?
  34. Calculating Covariance with Python and Numpy
  35. How to access the ith column of a NumPy multidimensional array?
  36. Dump a NumPy array into a csv file
  37. Python: find position of element in array
  38. Inverse of a matrix using numpy
  39. How to convert a PIL Image into a numpy array?
  40. numpy with python: convert 3d array to 2d
  41. Python: slicing a multi-dimensional array
  42. Pytorch reshape tensor dimension
  43. How to remove specific elements in a numpy array
  44. Add single element to array in numpy
  45. Overflow / math range error for log or exp
  46. 3-dimensional array in numpy
  47. Creating a Pandas DataFrame from a Numpy array: How do I specify the index column and column headers?
  48. Overflow Error in Python’s numpy.exp function
  49. How do you get the magnitude of a vector in Numpy?
  50. ‘list’ object has no attribute ‘shape’
  51. What is the difference between np.mean and tf.reduce_mean?
  52. How to calculate rolling / moving average using python + NumPy / SciPy?
  53. ValueError: object too deep for desired array while using convolution
  54. Make list of arrays in python
  55. Import Error: No module named numpy Anaconda
  56. Dictionary in a numpy array?
  57. RuntimeWarning: divide by zero encountered in log
  58. What does ‘index 0 is out of bounds for axis 0 with size 0’ mean?
  59. pandas create new column based on values from other columns / apply a function of multiple columns, row-wise
  60. Moving average or running mean
  61. ValueError: x and y must be the same size
  62. Error NameError: name ‘np’ is not defined
  63. How to fix “TypeError: len() of unsized object”
  64. NumPy List Comprehension Syntax
  65. Linear regression with matplotlib / numpy
  66. How to calculate a Gaussian kernel matrix efficiently in numpy?
  67. How to get the unit vector from a numpy array
  68. Does Numpy automatically detect and use GPU?
  69. How can I check whether a numpy array is empty or not?
  70. pandas DataFrame: replace nan values with average of columns
  71. “Divide by zero encountered in log” when not dividing by zero
  72. RuntimeError: module compiled against API version a but this version of numpy is 9
  73. Good ways to “expand” a numpy ndarray?
  74. TypeError: ‘numpy.float64’ object does not support item assignment
  75. numpy-equivalent of list.pop?
  76. Efficiently sorting a numpy array in descending order?
  77. How to create a numpy array of lists?
  78. How to add column to numpy array
  79. How to fix ‘RuntimeWarning: divide by zero encountered in double_scalars’
  80. IndexError: index 2 is out of bounds for axis 0 with size 2
  81. Coalesce values from 2 columns into a single column in a pandas dataframe
  82. Compute a confidence interval from sample data
  83. Create numpy matrix filled with NaNs
  84. How do I compute derivative using Numpy?
  85. ImportError: cannot import name NUMPY_MKL
  86. built-in range or numpy.arange: which is more efficient?
  87. Numpy Resize/Rescale Image
  88. numpy array concatenation error: 0-d arrays can’t be concatenated
  89. Convert a 1D array to a 2D array in numpy
  90. inverting image in Python with OpenCV
  91. How to print the full NumPy array, without truncation?
  92. Calculate weighted average using a pandas/dataframe
  93. RuntimeError: module compiled against API version 0xc but this version of numpy is 0xb
  94. Complex number troubles with numpy
  95. Filtering a NumPy Array
  96. How to install numpy to Python 3.5?
  97. Function to determine if two numbers are nearly equal when rounded to n significant decimal digits
  98. TypeError: zip argument #2 must support iteration
  99. CS231n: How to calculate gradient for Softmax loss function?
  100. numpy/scipy/ipython:Failed to interpret file as a pickle

Leave a Comment