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

Question

Safia 2022-9-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1803750-how-to-return-value-to-zero-before-index-of-specific-element-in-matrix

评论： Safia 2022-9-12

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

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Answer 1

Matt J 2022-9-12

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https://ww2.mathworks.cn/matlabcentral/answers/1803750-how-to-return-value-to-zero-before-index-of-specific-element-in-matrix#answer_1051985

编辑：Matt J 2022-9-12

在 MATLAB Online 中打开

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