extract column numpy array python
# Extract/ Slice only the 3rd column from the numpy array
print(a2[:,[2]])extract column numpy array python
# Extract/ Slice only the 3rd column from the numpy array
print(a2[:,[2]])get column or row of matrix array numpy python
test = numpy.array([[1, 2], [3, 4], [5, 6]])
column = test[:,0]
# column == array([1, 3, 5])
row = test[1,:]
# row == array([3, 4])how to get the first few lines of an ndarray
In [11]: a[:,:2]
Out[11]:
array([[-0.57098887, -0.4274751 ],
[-0.22279713, -0.51723555],
[ 0.67492385, -0.69294472],
[ 0.41086611, 0.26374238]])data[:,:2]
X = dataset[:,0:3] is interpreted as "All rows for columns 0 through 3" and y = dataset[:,4] is interpreted as "all rows for column 4".Copyright © 2021 Codeinu
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