Memory leak in symbolic toolbox?

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Ondrej
Ondrej 2012-1-30
If I try this simple code:
W = 1/100*ones(100); W = sym(W); x = rand(100,1);
for i=1:10000 x = double(W*x); end
which basically does nothing, the memory usage constantly grows, although there is no reason for it. Value x is constant double precision. I don't see this behaviour when the matrix W is not symbolic. It seems like a memory leak in the symbolic toolbox to me. I tried it with Matlab 7.9.0(R2009b) and also latest Matlab 2011b.
Another question is that I noticed that doing a matrix multiplication with symbolic matrix is not a multithreaded operation (in comparison to normal matrix multiplication). Is there some reason for that?

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