extract certain lines in matrice

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Dija
Dija 2015-5-6
评论： Dija 2015-5-6
hi everyone i have this matrice
0.8979 0.8979 0.8979 0.8979 0.8979 0.8979 0.8979 0.8979
0.5934 -0.5934 0.5934 -0.5934 0.5934 -0.5934 0.5934 -0.5934
0.5934 0.5934 -0.5934 -0.5934 0.5934 0.5934 -0.5934 -0.5934
0.8979 -0.8979 -0.8979 0.8979 0.8979 -0.8979 -0.8979 0.8979
0.5934 0.5934 0.5934 0.5934 -0.5934 -0.5934 -0.5934 -0.5934
0.8979 -0.8979 0.8979 -0.8979 -0.8979 0.8979 -0.8979 0.8979
0.8979 0.8979 -0.8979 -0.8979 -0.8979 -0.8979 0.8979 0.8979
0.5934 -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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Guillaume
Guillaume 2015-5-6
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
0.5934 -0.5934 0.5934 -0.5934 0.5934 -0.5934 0.5934 -0.5934
0.5934 0.5934 -0.5934 -0.5934 0.5934 0.5934 -0.5934 -0.5934
0.8979 -0.8979 -0.8979 0.8979 0.8979 -0.8979 -0.8979 0.8979
0.5934 0.5934 0.5934 0.5934 -0.5934 -0.5934 -0.5934 -0.5934
0.8979 -0.8979 0.8979 -0.8979 -0.8979 0.8979 -0.8979 0.8979
0.8979 0.8979 -0.8979 -0.8979 -0.8979 -0.8979 0.8979 0.8979
0.5934 -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

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