making a 4 x 3 matrix with elements from a 3x7 matrix

Question

Brandon 2023-9-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2026052-making-a-4-x-3-matrix-with-elements-from-a-3x7-matrix

评论： Brandon 2023-9-26

采纳的回答： David Goodmanson

m1 is 3x7

m2 is 4x3

need to pull 4 columns from m1 to make the 4 rows for m2

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Answer 1

David Goodmanson 2023-9-26

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2026052-making-a-4-x-3-matrix-with-elements-from-a-3x7-matrix#answer_1318952

编辑：David Goodmanson 2023-9-26

在 MATLAB Online 中打开

Hi Brandon,

m1 = rand(3,7)
m2 = m1(:,[1 3 4 5]).'
m1 =
    0.0357    0.6787    0.3922    0.7060    0.0462    0.6948    0.0344
    0.8491    0.7577    0.6555    0.0318    0.0971    0.3171    0.4387
    0.9340    0.7431    0.1712    0.2769    0.8235    0.9502    0.3816
m2 =
    0.0357    0.8491    0.9340
    0.3922    0.6555    0.1712
    0.7060    0.0318    0.2769
    0.0462    0.0971    0.8235

for example, where the columns have been indicated. The .' takes the transpose, and it has to be used if m1 has any complex values, because ' takes the complex conjugate transpose.