Numpy extract submatrix

Give np.ix_ a try:

Y[np.ix_([0,3],[0,3])]

This returns your desired result:

In [25]: Y = np.arange(16).reshape(4,4)
In [26]: Y[np.ix_([0,3],[0,3])]
Out[26]:
array([[ 0,  3],
       [12, 15]])

Related Posts:

  1. TypeError: only integer scalar arrays can be converted to a scalar index with 1D numpy indices array
  2. ImportError: DLL load failed: The specified module could not be found
  3. ImportError: DLL load failed: The specified module could not be found
  4. Import Error: No module named numpy
  5. ValueError: setting an array element with a sequence
  6. numpy max vs amax vs maximum
  7. What exactly does numpy.exp() do? [closed]
  8. Difference between import numpy and import numpy as np
  9. What is the purpose of meshgrid in Python / NumPy?
  10. why numpy.ndarray is object is not callable in my simple for python loop
  11. numpy division with RuntimeWarning: invalid value encountered in double_scalars
  12. Numpy ValueError: setting an array element with a sequence. This message may appear without the existing of a sequence?
  13. numpy: Invalid value encountered in true_divide
  14. python numpy ValueError: operands could not be broadcast together with shapes
  15. How to fix ‘Object arrays cannot be loaded when allow_pickle=False’ for imdb.load_data() function?
  16. How do I create an empty array/matrix in NumPy?
  17. Most efficient way to find mode in numpy array
  18. ValueError: Unknown label type: ‘continuous’
  19. TypeError: unhashable type: ‘numpy.ndarray’
  20. How to fix IndexError: invalid index to scalar variable
  21. Could not install packages due to a “Environment error :[error 13]: permission denied : ‘usr/local/bin/f2py'”
  22. numpy division with RuntimeWarning: invalid value encountered in double_scalars
  23. How does numpy.newaxis work and when to use it?
  24. numpy matrix vector multiplication
  25. Converting list to numpy array
  26. How do I read CSV data into a record array in NumPy?
  27. data type not understood
  28. How do you do natural logs (e.g. “ln()”) with numpy in Python?
  29. How do I read CSV data into a record array in NumPy?
  30. Plotting a 2D heatmap with Matplotlib
  31. How to normalize a NumPy array to a unit vector?
  32. Should I use np.absolute or np.abs?
  33. What does numpy.random.seed(0) do?
  34. ImportError: numpy.core.multiarray failed to import
  35. Factorial in numpy and scipy
  36. What does the c underscore expression `c_` do exactly?
  37. Convert pandas dataframe to NumPy array
  38. ImportError: Missing required dependencies [‘numpy’]
  39. Unable to plot Double Bar, Bar plot using pyplot for ndarray
  40. Error: all the input array dimensions except for the concatenation axis must match exactly
  41. ImportError: numpy.core.multiarray failed to import
  42. How to count the occurrence of certain item in an ndarray?
  43. size of NumPy array
  44. Singular matrix issue with Numpy
  45. Python Pandas – Missing required dependencies [‘numpy’] 1
  46. numpy array concatenate: “ValueError: all the input arrays must have same number of dimensions”
  47. How to find all occurrences of an element in a list
  48. TypeError: ‘numpy.float64’ object is not callable
  49. TypeError: ‘numpy.float64’ object is not callable
  50. ‘DataFrame’ object has no attribute ‘sort’
  51. Convert a tensor to numpy array in Tensorflow?
  52. ‘DataFrame’ object has no attribute ‘sort’
  53. Convert a tensor to numpy array in Tensorflow?
  54. ValueError: all the input arrays must have same number of dimensions
  55. TypeError: cannot unpack non-iterable int objec
  56. ValueError: setting an array element with a sequence
  57. filename.whl is not a supported wheel on this platform
  58. Using Numpy Vectorize on Functions that Return Vectors
  59. Use a.any() or a.all()
  60. TypeError: ‘numpy.float64’ object is not callable?
  61. ‘DataFrame’ object has no attribute ‘sort’
  62. Convert a tensor to numpy array in Tensorflow?
  63. How to normalize a NumPy array to a unit vector?
  64. How to raise a numpy array to a power? (corresponding to repeated matrix multiplications, not elementwise)
  65. convert nan value to zero
  66. What is dtype(‘O’), in pandas?
  67. ‘End of statement expected’ in pycharm
  68. How can I upgrade NumPy?
  69. Most efficient way to map function over numpy array
  70. What does numpy.gradient do?
  71. Is there a NumPy function to return the first index of something in an array?
  72. How can the Euclidean distance be calculated with NumPy?
  73. How to get element-wise matrix multiplication (Hadamard product) in numpy?
  74. Numpy/Python Array Value error
  75. ‘list’ object has no attribute ‘shape’
  76. What is dtype(‘O’), in pandas?
  77. initialize a numpy array
  78. ValueError: could not broadcast input array from shape (224,224,3) into shape (224,224)
  79. TypeError: ‘DataFrame’ object is not callable
  80. Overflow Error in Python’s numpy.exp function
  81. load csv into 2D matrix with numpy for plotting
  82. Cannot convert list to array: ValueError: only one element tensors can be converted to Python scalars
  83. How can I use numpy.correlate to do autocorrelation?
  84. ValueError: ‘object too deep for desired array’
  85. Calculating Covariance with Python and Numpy
  86. Purpose of `numpy.log1p( )`?
  87. How to access the ith column of a NumPy multidimensional array?
  88. LinAlgError: Last 2 dimensions of the array must be square
  89. Dump a NumPy array into a csv file
  90. Python: find position of element in array
  91. What does axis in pandas mean?
  92. How to take column-slices of dataframe in pandas
  93. Pytorch tensor to numpy array
  94. Inverse of a matrix using numpy
  95. ‘numpy.float64’ object is not iterable
  96. How to convert a PIL Image into a numpy array?
  97. Overcome ValueError for empty array
  98. numpy with python: convert 3d array to 2d
  99. Python: slicing a multi-dimensional array
  100. index 1 is out of bounds for axis 0 with size 1

Leave a Comment

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)