How to return value to zero before index of specific element in matrix?

Hi all!

I have a matrix (m*n), in each row i have a specific element that i want all element before it to be set to zero.

I extracted the index of specific element in column vector "V" . all i need now is to return values before this index "0".

thanks

Answer 1

[Matt J]

m=4;n=8;

Matrix=rand(m,n),

Matrix = 4×8

0.1866 0.9389 0.4492 0.7203 0.0563 0.4231 0.2116 0.7976 0.8085 0.5572 0.6158 0.9831 0.7248 0.2271 0.2121 0.2003 0.1690 0.7889 0.3033 0.0181 0.7499 0.4327 0.9734 0.0099 0.5639 0.1376 0.0910 0.0868 0.3564 0.9456 0.1187 0.6761

V=[3;7;2;5];

Matrix=Matrix.*((1:n)>=V),

Matrix = 4×8

0 0 0.4492 0.7203 0.0563 0.4231 0.2116 0.7976 0 0 0 0 0 0 0.2121 0.2003 0 0.7889 0.3033 0.0181 0.7499 0.4327 0.9734 0.0099 0 0 0 0 0.3564 0.9456 0.1187 0.6761

[Safia]

@Matt J Hi! thank you for your answer ! it works well!