Examples of how to replace array line by another array line with numpy:

### Array of same size

let's try to replace array N line 2 by array M line 2:

`>>> import numpy as np`

`>>> M = np.array([[2,7,1],[3,3,1],[5,4,2],[0,1,8]])`

`>>> N = np.zeros((6,3))`

`>>> N[2,:] = M[2,:]`

`>>> N`

`array([[ 0., 0., 0.],`

`[ 0., 0., 0.],`

`[ 5., 4., 2.],`

`[ 0., 0., 0.],`

`[ 0., 0., 0.],`

`[ 0., 0., 0.]])`

### Array of different sizes (N column > M column)

if dimension 2 of array M is not the same dimension that N:

`>>> import numpy as np`

`>>> M = np.array([[2,7,1],[3,3,1],[5,4,2],[0,1,8]])`

`>>> N = np.zeros((6,4))`

`>>> M_dim_2 = M.shape[1]`

`>>> N_dim_2 = N.shape[1]`

`>>> M_dim_2`

`3`

`>>> N_dim_2`

`4`

`>>> if N_dim_2 > M_dim_2:`

`... N[2,:M_dim_2] = M[2,:]`

`...`

`>>> N`

`array([[ 0., 0., 0., 0.],`

`[ 0., 0., 0., 0.],`

`[ 5., 4., 2., 0.],`

`[ 0., 0., 0., 0.],`

`[ 0., 0., 0., 0.],`

`[ 0., 0., 0., 0.]])`

### Array of different sizes (N column < M column)

`>>> N = np.zeros((6,2))`

`>>> N_dim_2 = N.shape[1]`

`>>> N_dim_2`

`2`

`>>> if N_dim_2 < M_dim_2:`

`... N[2,:] = M[2,:N_dim_2]`

`...`

`>>> N`

`array([[ 0., 0.],`

`[ 0., 0.],`

`[ 5., 4.],`

`[ 0., 0.],`

`[ 0., 0.],`

`[ 0., 0.]])`

### References

Links | Site |
---|---|

Modify a particular row/column of a NumPy array | stackoverflow |

Numpy replace specific rows and columns of one array with specific rows and columns of another array | stackoverflow |