Passing to a MATLAB function arguments from an array and saving function results using FOR-loop

Question

I need to run a specific function 4 times, each time passing new arguments to it (getting them from array) and save the result in another array after each iteration.

Here is my function:

function VD (x,y,z)
(2*x*y*z)/1000

Here are my arrays with values:

x = [1,2,3]
y = [4,5,6]
z = [7,8,9]

Here is where I'm getting a mistake:

for i=1:4
result{i} = VD(x(i),y(i),z(i));
end

Mistake - Subscript indices must either be real positive integers or logicals.

I'd like to have array result with 4 values, where each value is a result of VD function return.

Hope it's clear.

Thank you.

Gordon Bean · Accepted Answer · 2013-08-22 23:04:23Z

1

You can avoid using the loop altogether:

x = [1,2,3]
y = [4,5,6]
z = [7,8,9]

result = 2 * x .* y .* z ./ 1000;

answered Aug 22, 2013 at 23:04

Gordon Bean

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1 Comment

Gordon Bean Over a year ago

Without the '.', the '' will perform a matrix multiplication. Try the following to see what I mean: A=rand(4); B=rand(4); AB, A.*B

Patrick Sanan · Accepted Answer · 2013-08-22 23:10:44Z

1

Your function does not have a return value. It merely prints the results to the screen. Replacing your function definition with something like

function r = VD(x,y,z)
r = (2*x*y*z)/1000;

may help. However, there are much more efficient ways to do this particular task - see Gordon's answer on how to vectorize.

answered Aug 22, 2013 at 23:10

Patrick Sanan

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