extract certain lines in matrice

Question

Dija 2015-5-6

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/215358-extract-certain-lines-in-matrice

评论： Dija 2015-5-6

hi everyone i have this matrice

8979    0.8979    0.8979    0.8979    0.8979    0.8979    0.8979    0.8979
5934   -0.5934    0.5934   -0.5934    0.5934   -0.5934    0.5934   -0.5934
5934    0.5934   -0.5934   -0.5934    0.5934    0.5934   -0.5934   -0.5934
8979   -0.8979   -0.8979    0.8979    0.8979   -0.8979   -0.8979    0.8979
5934    0.5934    0.5934    0.5934   -0.5934   -0.5934   -0.5934   -0.5934
8979   -0.8979    0.8979   -0.8979   -0.8979    0.8979   -0.8979    0.8979
8979    0.8979   -0.8979   -0.8979   -0.8979   -0.8979    0.8979    0.8979
5934   -0.5934   -0.5934    0.5934   -0.5934    0.5934    0.5934   -0.5934

I want to extract the line 1&2&4&7 in order to put them in another equation can anyone give me the code to put certain lines in another place

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Answer 1

Guillaume 2015-5-6

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/215358-extract-certain-lines-in-matrice#answer_178064

在 MATLAB Online 中打开

This is very basic matrix indexing which is covered in the Getting started tutorial:

m = [0.8979    0.8979    0.8979    0.8979    0.8979    0.8979    0.8979    0.8979
5934   -0.5934    0.5934   -0.5934    0.5934   -0.5934    0.5934   -0.5934
5934    0.5934   -0.5934   -0.5934    0.5934    0.5934   -0.5934   -0.5934
8979   -0.8979   -0.8979    0.8979    0.8979   -0.8979   -0.8979    0.8979
5934    0.5934    0.5934    0.5934   -0.5934   -0.5934   -0.5934   -0.5934
8979   -0.8979    0.8979   -0.8979   -0.8979    0.8979   -0.8979    0.8979
8979    0.8979   -0.8979   -0.8979   -0.8979   -0.8979    0.8979    0.8979
5934   -0.5934   -0.5934    0.5934   -0.5934    0.5934    0.5934   -0.5934];
subm = m([1 2 4 7], :); %select all columns of rows 1, 2, 4 and 7