```
# multiply row 0 of the new matrix A_ref by -1 and add it to the row 3
A_ref = AddRows(A_ref,0,3,-1)
```

how to solve this as how can i add back to row 3 there is not any function for this kindly help

```
# multiply row 0 of the new matrix A_ref by -1 and add it to the row 3
A_ref = AddRows(A_ref,0,3,-1)
```

how to solve this as how can i add back to row 3 there is not any function for this kindly help

1 Like

Hi @Ghulam_Nabi ,

These functions such as AddRows() and others used in ex4 should have been done in ex3. If you have not done ex3, please revisit and add the code there.

I have done ex 3 but there is no function for this