Writing 2 vectors within matrix

Hi!

I have 2 vectores I where are written the indexes of a matrix M and J which are the values that I want to write on matrix M. Bellow I give a generic example, how can I do it automatically?

I=[1 1 1 2 2 2 3 3 3];
J=[2 4 7 3 1 4 9 6 4];
M=[2 4 7; 3 1 4; 9 6 4];

Hope you can help me!

Answer 1

[fred ssemwogerere]

Hello, use reshape

M=reshape(J,[3,3])';

[Miguel Cardoso]

Thank you!