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

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m1 is 3x7
m2 is 4x3
need to pull 4 columns from m1 to make the 4 rows for m2

Risposta accettata

David Goodmanson
David Goodmanson il 26 Set 2023
Modificato: David Goodmanson il 26 Set 2023
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.

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