Function to extract certain elements from a matrix

2014 4 10
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更新时间：2014 4 10
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I have difficulties in making a function to extract columns after first number in the row from a the matrix. For example I have this matrix (A) and I want all columns that have first element 1 to be extracted in another matrix
A= 1 2 1 1 3
2 5 6 4 8
2 3 5 7 8
And I want my function to return this:
B= 1 1 1
2 6 4
2 5 7

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Mischa Kim
Mischa Kim 2014-4-10

2 个投票

Ciuban, use
B = A(:,A(1,:)==1)

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Sebastian Ciuban
Sebastian Ciuban 2014-4-10
It is possible to make a function, for example if I write extract(4) and in returns me all columns that have first element 4?
Mischa Kim
Mischa Kim 2014-4-10
Sure
function B = extr(A,extrnum)
B = A(:,A(1,:)==extrnum);
end

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