Function to Vector

Hello all,

I am currently attempting to have my function be able to output a vector into the workspace. Currently i have tried to something like this (simplified a lot but this is the jist of it)

for i = 1:10
a(i) = crr(x)
end

where a(i) is supposed to be my output vector and crr is my function, x is some vector that crr acts on. crr just outputs one numerical value. even when i do something like a = crr(x) i get an error message that says "too many output values"

if anybody knowss a way that allows crr to output a vector into the workspace, your help would be much appreciated.

dustin

[the cyclist]

Can you post a (possibly simplified) version of the function crr() that give the error message?

Also, you could use the debugger ("dbstop if error") to halt execution when the error occurs, to see exactly what your variables look like.

[Dustin]

function crr(cc)

vals;

cc=cc/sum(cc);

afc = sum(com(310:359,:))./sum(com(:,:));

afr = sum(ray(310:359,:))./sum(ray(:,:));

TcrossI = 0;

TcrossO = 0;

for iz = 1:40,

TcrossI = TcrossI + (sum(sigma143(iz,2:4)))*cc(iz);

TcrossO = TcrossO + (sum(sigma137(iz,2:4)))*cc(iz);

end

TcrossC = TcrossO + TcrossI;

TcrossR = TcrossI + TcrossI;

Ct = 0;

Rt = 0;

for iz = 1:40,

Ct = Ct + afc(iz)*sigma143(iz,3)*cc(iz);

Rt = Rt + afr(iz)*sigma143(iz,2)*cc(iz);

end

Tcom = Ct/TcrossC;

Tray = Rt/TcrossR;

CRratio = Tcom/Tray;

disp(CRratio)

This is the code, its nothing too complicated, im mostly interested in the value CRratio as output in the work space. cc is a vector, and im interested in changing several elements of cc in order to generate multiple CRratios as a vector. I hope that made sense!

Answer 1

[Andrew Newell]

It is very natural for functions to output vectors in MATLAB. See the documentation for function for some examples. Here is a very simple example:

function y = crr(x)
y = x.^2;

Store this in a file crr.m, and run:

x = 1:10;
a = crr(x)

Answer 2

[Walter Roberson]

That error would occur if your function crr() was not defined as returning any values. Andrew's Answer shows what the declaration should look like.

Answer 3

[Honglei Chen]

If I understand your question correctly, you need to do

for i = 1:10
  a(i) = crr(x(i))
end

But you could try arrayfun, e.g.,

a = arrayfun(@crr,x)