Numpy reshape()

numpy.reshape(a, newshape, order='C')

Shape: (3, 4) Dimension 2	Shape: (4, 3) Dimension 2

1. While reshaping data of the original array will not be lost.
2. The reshape array must be compatible with original shape , otherwise value error will be raised.

One dimensional array

import numpy as np
ar=np.ones((6,))
print(ar)
print("Shape: ", ar.shape)
print("Dimension ", ar.ndim)
ar=ar.reshape((2,3))
print("##After using reshpae()##")
print(ar)
print("Shape: ", ar.shape)
print("Dimension ", ar.ndim)

[1. 1. 1. 1. 1. 1.]
Shape:  (6,)
Dimension  1
##After using reshpae()##
[[1. 1. 1.]
 [1. 1. 1.]]
Shape:  (2, 3)
Dimension  2

Two dimensional array

import numpy as np
ar=np.ones((3,2))
print(ar)
print("Shape: ", ar.shape)
print("Dimension ", ar.ndim)
ar=ar.reshape((2,3))
print("##After using reshpae()##")
print(ar)
print("Shape: ", ar.shape)
print("Dimension ", ar.ndim)

[[1. 1.]
 [1. 1.]
 [1. 1.]]
Shape:  (3, 2)
Dimension  2
##After using reshpae()##
[[1. 1. 1.]
 [1. 1. 1.]]
Shape:  (2, 3)
Dimension  2

Three dimensional array

import numpy as np
ar=np.ones((3,2,3))
print(ar)
print("Shape: ", ar.shape)
print("Dimension ", ar.ndim)

ar=ar.reshape((2,3,3))
print("##After using reshpae()##")
print(ar)
print("Shape: ", ar.shape)
print("Dimension ", ar.ndim)

[[[1. 1. 1.]
  [1. 1. 1.]]

 [[1. 1. 1.]
  [1. 1. 1.]]

 [[1. 1. 1.]
  [1. 1. 1.]]]
Shape:  (3, 2, 3)
Dimension  3
##After using reshpae()##
[[[1. 1. 1.]
  [1. 1. 1.]
  [1. 1. 1.]]

 [[1. 1. 1.]
  [1. 1. 1.]
  [1. 1. 1.]]]
Shape:  (2, 3, 3)
Dimension  3

Four dimensional array

import numpy as np
ar=np.ones((3,2,3,4))
print(ar)
print("Shape: ", ar.shape)
print("Dimension ", ar.ndim)

ar=ar.reshape((9,8))
print("##After using reshpae()##")
print(ar)
print("Shape: ", ar.shape)
print("Dimension ", ar.ndim)

[[[[1. 1. 1. 1.]
   [1. 1. 1. 1.]
   [1. 1. 1. 1.]]

  [[1. 1. 1. 1.]
   [1. 1. 1. 1.]
   [1. 1. 1. 1.]]]


 [[[1. 1. 1. 1.]
   [1. 1. 1. 1.]
   [1. 1. 1. 1.]]

  [[1. 1. 1. 1.]
   [1. 1. 1. 1.]
   [1. 1. 1. 1.]]]


 [[[1. 1. 1. 1.]
   [1. 1. 1. 1.]
   [1. 1. 1. 1.]]

  [[1. 1. 1. 1.]
   [1. 1. 1. 1.]
   [1. 1. 1. 1.]]]]
Shape:  (3, 2, 3, 4)
Dimension  4
##After using reshpae()##
[[1. 1. 1. 1. 1. 1. 1. 1.]
 [1. 1. 1. 1. 1. 1. 1. 1.]
 [1. 1. 1. 1. 1. 1. 1. 1.]
 [1. 1. 1. 1. 1. 1. 1. 1.]
 [1. 1. 1. 1. 1. 1. 1. 1.]
 [1. 1. 1. 1. 1. 1. 1. 1.]
 [1. 1. 1. 1. 1. 1. 1. 1.]
 [1. 1. 1. 1. 1. 1. 1. 1.]
 [1. 1. 1. 1. 1. 1. 1. 1.]]
Shape:  (9, 8)
Dimension  2

Subhendu Mohapatra

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