# Division matrix

wxjmfauth at gmail.com wxjmfauth at gmail.com
Wed Nov 14 10:04:09 CET 2012

```Le mardi 13 novembre 2012 02:00:28 UTC+1, Cleuson Alves a écrit :
> Hello, I need to solve an exercise follows, first calculate the inverse matrix and then multiply the first matrix.
>
> I await help.
>
> Thank you.
>
> follows the code below incomplete.
>
>
>
> m = [[1,2,3],[4,5,6],[7,8,9]]
>
> x = []
>
> for i in [0,1,2]:
>
>     y = []
>
>     for linha in m:
>
>         y.append(linha[i])
>
>     x.append(y)
>
>
>
> print x
>
> [[1, 4, 7], [2, 5, 8], [3, 6, 9]]
>
>
>
> def ProdMatrix(x,b):
>
>     tamL = len(x)
>
>     tamC = len(x[0])
>
>     c = nullMatrix(tamL,tamC)
>
>     for i in range(tamL):
>
>         for j in range(tamC):
>
>             val = 0
>
>             for k in range(len(b)):
>
>                 val = val + x[i][l]*b[k][j]
>
>             c[i][j]
>
>     return c

------

Pedagogical hint:
Before blindly calculating the inverse matrix, it may be
a good idea to know if the inverse matrix exists.

jmf

```