Saving successive results ?

Hi. I need some help with the problem below.

for k = 1:1:n;

      sum = k^2+2k; % Just an example

end

At the end of the run, I wish to have a total of n variables named, say, array_1, array_2, ... array_n. Each array should contain the value of the sum associated with the respective k. So, array_1 = 3, array 2 = 8, and so on.

I am having trouble renaming the variable. Any help?

Answer 1

[Friedrich]

Hi,

what you like to do can be done with eval:

n = 5;
for k = 1:1:n;
      eval(['array_',num2str(k),'= k^2+2*k;']); % Just an example
end

But I would recommend avoid eval and use a Cell instead to capture the output:

n = 5;
array = cell(n,1);
for k = 1:1:n;
      array{k} = k^2+2*k;
end

For some more details look under the following link for "How can I create variables A1, A2,...,A10 in a loop?"

http://matlab.wikia.com/wiki/FAQ

[Jason]

Friedrich, may I ask one question? The line "array = cell(n, 1);" does preallocating, am I right?

[Friedrich]

Yes it does.

[Jason]

Very well, thanks a lot for the cell suggestion.