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How can I create a new matrix from selected number of columns of an existing matrix

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Hugo
Hugo 2022-1-27
回答： Benjamin Thompson 2022-1-27
If I have a vector
x=[1,2,3,5]
and a matrix A with size 5*10
how can I get, concatenate and save the columns of the matrix A that are stated in the vector x, in a new matrix, called B
In my example above, if the first 5 columns of A are [2,3,4,5;4,5,4,2;7,5,6,4;5,6,5,4;3,4,3,4] ans must be:
B= [2,3,4,5;4,5,4,2;7,5,6,4;3,4,3,4]
I.e., the 4th column of the matrix A has been surpress in the writing of the matrix B

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采纳的回答

Benjamin Thompson
Benjamin Thompson 2022-1-27
x =
1 2 3 5
>> A = rand(5,10)
A =
0.8147 0.0975 0.1576 0.1419 0.6557 0.7577 0.7060 0.8235 0.4387 0.4898
0.9058 0.2785 0.9706 0.4218 0.0357 0.7431 0.0318 0.6948 0.3816 0.4456
0.1270 0.5469 0.9572 0.9157 0.8491 0.3922 0.2769 0.3171 0.7655 0.6463
0.9134 0.9575 0.4854 0.7922 0.9340 0.6555 0.0462 0.9502 0.7952 0.7094
0.6324 0.9649 0.8003 0.9595 0.6787 0.1712 0.0971 0.0344 0.1869 0.7547
>> A(:,x)
ans =
0.8147 0.0975 0.1576 0.6557
0.9058 0.2785 0.9706 0.0357
0.1270 0.5469 0.9572 0.8491
0.9134 0.9575 0.4854 0.9340
0.6324 0.9649 0.8003 0.6787

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