MATLAB: Saving existing matrix

existif statementlogical?

Hi,

I would like to find a way to tell my code that if at the end of the loop the matrix 'P' exists then to save it, if not to continue the loop. I wrote that:

 z=exist('P','var')
 if z>0
 save
 end

It is wroking but, is it a good way to write it?

Cheers

Best Answer

Why would P exist sometimes and not others? If it is created somewhere in the loop, presumably an IF statement or other such branch, why not just save it there? Since your saved variable will be overwritten each time through the loop (that P exists), why not save after the loop?

Related Solutions

MATLAB: Coding for nested loop problem

for p = 1:10
    for q = 1:10
        if p ~= q
            ...
        end
    end
end

Without a for loop:

x     = rand(10, 10);
index = (1:10) ~= (1:10).';
mean(x(index))  % Mean of elements, which are not on main diagonal

MATLAB: How to store data from the IF loop

Well, you don't have a loop at the moment. 'if' is not a loop, it is just a single statement.

Something similar to the following is what you need. I went off your words rather than code for the criteria in the if statements as your code does not match what you state as the conditions.

for n = 1:numel( q )
...
if q(n) < q1(n)
   p(n) = p1(n);
elseif q(n) <= q2(n) + g1(n)
   p(n) = p2(n);
else
   p(n) = p3(n);
end
end

Best Answer

Related Solutions

MATLAB: Coding for nested loop problem

MATLAB: How to store data from the IF loop

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