How to add a dimension to a numpy array in Python

Question

I have an array that is size (214, 144). I need it to be (214,144,1) is there a way to do this easily in Python? Basically the dimensions are supposed to be (Days, Times, Statio

Answer 1

You could use reshape:

>>> a = numpy.array([[1,2,3,4,5,6],[7,8,9,10,11,12]])
>>> a.shape
(2, 6)
>>> a.reshape((2, 6, 1))
array([[[ 1],
        [ 2],
        [ 3],
        [ 4],
        [ 5],
        [ 6]],

       [[ 7],
        [ 8],
        [ 9],
        [10],
        [11],
        [12]]])
>>> _.shape
(2, 6, 1)

Besides changing the shape from (x, y) to (x, y, 1), you could use (x, y/n, n) as well, but you may want to specify the column order depending on the input:

>>> a.reshape((2, 3, 2))
array([[[ 1,  2],
        [ 3,  4],
        [ 5,  6]],

       [[ 7,  8],
        [ 9, 10],
        [11, 12]]])
>>> a.reshape((2, 3, 2), order='F')
array([[[ 1,  4],
        [ 2,  5],
        [ 3,  6]],

       [[ 7, 10],
        [ 8, 11],
        [ 9, 12]]])