# how to use a function

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ben zekri raouf on 21 Feb 2015
i have a function that convert numbers to arabic letters called " num2wordsarabe" it works good,but when i try to use it directly in "strrep" or any other function ,it does not work ,also i tried to pose x=num2wordsarabe(n) and use "x" in "strrep",it didnt work neither here is the exampl:
for i=1:length(str)
if (abs(str(i))>=48)&&(abs(str(i))<=57)
n=str2double(str(i));
num2wordsarabe(n);
str=strrep(str,str(i),num2wordsarabe(n));
end
end
result on workspace:
[ ??? Error using ==> num2wordsarabe
Too many output arguments.
Error in ==> test at 15
str=strrep(str,str(i),num2wordsarabe(n));]
Any help is greatly appreciated.
Andrew Newell on 21 Feb 2015
I reformatted the original question. I assume that the curly brackets were an attempt to format it, not the code.

Guillaume on 21 Feb 2015
Your understanding of the syntax of functions is a bit wrong. As per Sad's answer, if you want to use the result of a function, that function needs to output something. Therefore your function needs to be at least:
function x = num2wordsarabe(n)
And actually, since x does not mean anything, I'd rather use a variable name with more meaning, e.g:
function arabewords = num2wordsarabe(n)
Within your function, you then of course need to assign some value to the output. Therefore, at some point(s) in the function you should have:
arabewords = ....; %replace the ... by some expression
Most likely, the ... is the output of these hundredarabe, tensarabe and unitsarabe functions whose results you don't do anything with. E.g.:
arabewords = sprintf('%s %s %s', hundredarabe(z), unitsarabe(x), tensarabe(y,x));
%and so on for the other else and if
Possibly, these other function also don't have declared output in them, so you would have to modify them as well the same. e.g:
function hundredword = hundredarabe(digit)
...
hundredword = ...;
end
yes! that's exactly my concern as well! Guillaume explained it better! ;)

Try making the first line of your function as:
function [x] = num2wordsarabe(n)
And now use it in strrep. I'm no expert in Matlab but give that a try!
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ben zekri raouf on 21 Feb 2015
thank you so much for your efforts,but unfortunately it didn't work,thnx any way :)