importnumpyasgeeka=geek.array([1,2,3])print("1st Input array :\n",a)b=geek.array([4,5,6])print("2nd Input array :\n",b)res=geek.vstack((a,b))print("Output vertically stacked array:\n ",res)

1st Input array :  [1 2 3]2nd Input array :  [4 5 6]Output vertically stacked array:  [[1 2 3] [4 5 6]]

The two 1D arrays a and b are stacked vertically usingnp.vstack(), combining them into a 2D array where each input array forms a row.

Syntax

numpy.vstack(tup)

Parameters:

• tup:[sequence of ndarrays] Tuple containing arrays to be stacked. The arrays must have the same shape along all but the first axis.

Return:[stacked ndarray] The stacked array of the input arrays.

Vertical Stacking of 2D Arrays Using numpy.vstack()

This code shows how to vertically stack two 2D arrays using numpy.vstack() resulting in a combined 2D array.

importnumpyasgeeka=geek.array([[1,2,3],[-1,-2,-3]])print("1st Input array :\n",a)b=geek.array([[4,5,6],[-4,-5,-6]])print("2nd Input array :\n",b)res=geek.vstack((a,b))print("Output stacked array :\n ",res)

1st Input array :  [[ 1  2  3] [-1 -2 -3]]2nd Input array :  [[ 4  5  6] [-4 -5 -6]]Output stacked array :  [[ 1  2  3] [-1 -2 -3] [ 4  5  6] [-4 -5 -6]]

Two 2D arrays a and b are vertically stacked, creating a new 2D array where each original array becomes a set of rows in the resulting array.