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From: Nives Fakin on 12 Aug 2010 12:25
the function is supposed to decompose matrix B to two new ones, C_1 and C_2. then, for each of the new matrices checks the condition and decompose if needed. i use n to name the new matrices, but if i define variable n=1 at the beginning of the function, it resets every time back to 1, and i don't know how to define it withot giving it a value. also, i have a problem with deleting the old matrix that i have decomposed beacuse i don't know which one is used of the two.

i'm not sure any more why i put clear B, but it helped at the moment :) i'll try to remove it

thank you very much
From: Walter Roberson on 12 Aug 2010 15:15
Nives Fakin wrote:
> a function i wrote requires defining the variable n, but if i define it
> in the begining of the function, since it is a recursion, it changes it
> to the old value every time. how to avoid it? please don't resent if it
> is a silly question, i'm a beginner with matlab.
>
> this is the critical loop inside the function "identification"
>
> for i=1:k
> if A(i)>thr
> eval(['C_' num2str(n) '=C(1:br1,1:br1)']);
> eval(['C_' num2str(n+1) '=C(br1+1:k,br1+1:k)']);

Why are you using eval ???

> n=n+2;
> clear B;
> counter=counter+1;
> identification(C(1:br1,1:br1));
> identification(C(br1+1:k,br1+1:k));
> break
> elseif i<k
> continue
> end
> end


function y = recurseme(x, n)
if ~exist('n', 'variable')
y = recurseme(x, 0);
else
n = n + 1;
if n <= x
y = n * recurseme(x-1, n+1);
else
y = x-1;
end
end
end


And no, I have no idea what that computes -- it's just a sample to show you
how you can deal with having an intermediate variable which is not part of the
user calling sequence.
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