Thread Subject: vectorization help

I have a vectorization problem that I could not find an
efficient way.
An example is like:

A = [1 3 5 8 19 23 32 33 36]; % A is a sorted integer array
B = round(100*rand(10)); % B is a random integer matrix

for ix = 1:length(A)
   B(B==A(ix)) = []; % if the element belongs to A
                          % delete it from B
end

I need to get rid of the for loop because in the real
problem, the size of A is > 100,000

Thanks,

"Salmon " <yourfellow@yahoo.com> wrote in message
news:g0k2ci$920$1@fred.mathworks.com...
>I have a vectorization problem that I could not find an
> efficient way.
> An example is like:
>
> A = [1 3 5 8 19 23 32 33 36]; % A is a sorted integer array
> B = round(100*rand(10)); % B is a random integer matrix
>
> for ix = 1:length(A)
> B(B==A(ix)) = []; % if the element belongs to A
> % delete it from B
> end
>
> I need to get rid of the for loop because in the real
> problem, the size of A is > 100,000
>
> Thanks,

HELP SETDIFF and/or HELP ISMEMBER.

--
Steve Lord
slord@mathworks.com

cool, thanks,

"Steven Lord" <slord@mathworks.com> wrote in message
<g0k5ik$5n7$1@fred.mathworks.com>..