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From: jenya polyakova on 25 Feb 2010 18:55
Let say I have two logicals:

r1 = [0 1 1]

and r2 where
r2{1} =[0 0 0 0]
r2{2}=[1 1]
r2{3}=[1 0 0 0 0 1]

Let's say I have cell array a where
a{1}=1:4;
a{2}=[10,5];
a{3}=[9,1:4,8];

I would like now to use r1 and r2 to do extract elements from a where r1 and r2 are non_zero.
so I would have
b = [ 10 5 9 8]

Of course I could loop to find non-zero elements....just looking for nicer solution as my real data is HUGE.
Thanks.
From: Wayne King on 25 Feb 2010 19:38
"jenya polyakova" <jenya56(a)yahoo.com> wrote in message <hm72l8$m0r$1(a)fred.mathworks.com>...
> Let say I have two logicals:
>
> r1 = [0 1 1]
>
> and r2 where
> r2{1} =[0 0 0 0]
> r2{2}=[1 1]
> r2{3}=[1 0 0 0 0 1]
>
> Let's say I have cell array a where
> a{1}=1:4;
> a{2}=[10,5];
> a{3}=[9,1:4,8];
>
> I would like now to use r1 and r2 to do extract elements from a where r1 and r2 are non_zero.
> so I would have
> b = [ 10 5 9 8]
>
> Of course I could loop to find non-zero elements....just looking for nicer solution as my real data is HUGE.
> Thanks.

Hi Jenya, one thing you can do is to use cellfun, but then I'm still using a loop to extract the elements from a:

Indices = cellfun(@(x) find(x==1), r2,'UniformOutput',false);


for k=1:size(Indices,2)
a{k}=a{k}(Indices{k});
end

Num = cell2mat(a);

Wayne
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