How can I clear columns and rows of a matrix?

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Ayob
Ayob 2014-1-19
编辑： Ayob 2014-1-19
I have matrix like A which is in a square form p*p and a line matrix B in a form of q*1 (q<p).
I want to clear rows and columns of matrix A with the help of B. for example:
A=[1 2 3 4;5 6 7 8;9 10 11 12;1 2 3 4]
and
B=[2 4]
I should eliminate second row and column 'As B(1)=2' and fourth row and column 'As B(2)=4'.
So A becomes [1 3;9 11].

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Amit
Amit 2014-1-19
编辑：Amit 2014-1-19
A(B,:) = [];
A(:,B) = [];
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Ayob
Ayob 2014-1-19
编辑：Ayob 2014-1-19
I check it,but didn't work .
??? Subscripted assignment dimension mismatch.

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