MATLAB向量范围表达式中的逻辑运算

Question

can I have something like

A=1:10;

A(1:2 && 5:6)=0;

meaning I want to zero out specific ranges within my vector index expression in one line

Is that possible?

And what if I wanted to zero out all the rest like

A(~[1:2]) = 0 

What's the way of logical NOT within vector indexing?

Thanks

Answer 1

The following should work:

idx = [1:2,5:6];
A(idx) = 0

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If you want to zero the complement of the vector of indices:

idx = [1:2,5:6];
A(~ismembc(1:length(A),idx)) = 0

Where ismembc is a faster, lightweight version of ismember that assumes the array is sorted and non-sparse with no NaN elements. (Credit goes to this question .)

Answer 2

Just do A([1:2 5:6]) . Ie, just create a vector of the indices you want to zero out.