How to create array from a function?

Question

gdp_p_h and p are vectors. But for some reason this doesn't want to work. I keep getting an error saying: "A(I) = X: X must have the same size as I"

for entry = gdp_p_h
      function_array(end + 1) = polyval(p,entry)
end;

Do not forget to accept the answer then, so it is useful for future "lost programmers"! :) — Ander Biguri
– Ander Biguri, Commented May 1, 2015 at 14:08

Ander Biguri · Accepted Answer · 2015-04-28 19:49:30Z

2

When using polyval, if entry is an array it will return something the same size.

In your case you are using the loop pretty badly, so entry will be a whole array and function_array(end+1) is only a single number, so it can not store an array.

2 options:

If you want to keep the loop (if you have more things inside), write it properly!

I am guessing that you want:

for ii=1:length(gdp_p_h)
     entry=gdp_p_h(ii);
     function_array(end + 1) = polyval(p,entry);
end

Else, if that's the only thing you are doing inside the loop, you just dont need it.

function_array=polyval(p,gdp_p_h);

will do the job.

Learn how to write for loops here: http://uk.mathworks.com/help/matlab/ref/for.html

edited Apr 28, 2015 at 19:49

answered Apr 28, 2015 at 9:43

Ander Biguri

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