Changing elements of row after certain element of m*n matrix

Question

Rajesh 2022-7-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1766400-changing-elements-of-row-after-certain-element-of-m-n-matrix

评论： Rajesh 2022-7-24

采纳的回答： Jan

在 MATLAB Online 中打开

Hi,

I have a m*n matrix where some of rows are like these for exmaple

x=[-1,-0.65,-0.45,0,0.3,0.8,1,0.4,0.2,-0.1;
   -1,-0.65,-0.45,0,0.3,0.8,0.9,1,0.2,-0.1]

I know the idx=[7,8] after which the elements become 0.

Now I need to make new row as follows using idx

x1=[-1,-0.65,-0.45,0,0.3,0.8,1,0,0,0;
    -1,-0.65,-0.45,0,0.3,0.8,0.9,1,0,0]

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Answer 1

Jan 2022-7-24

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1766400-changing-elements-of-row-after-certain-element-of-m-n-matrix#answer_1013820

编辑：Jan 2022-7-24

在 MATLAB Online 中打开

x    = [-1, -0.65, -0.45, 0, 0.3, 0.8, 1,  0.4, 0.2, -0.1;
        -1, -0.65, -0.45, 0, 0.3, 0.8, 0.9, 1,  0.2, -0.1];
idx  = [7, 8];
m    = (1:size(x, 2)) > idx(:);
x(m) = 0
x = 2×10
           -1        -0.65        -0.45            0          0.3          0.8            1            0            0            0
           -1        -0.65        -0.45            0          0.3          0.8          0.9            1            0            0