Thread Subject: Selecting the output argument of a function

Hello, I am trying to do something that seems quite simple, but I can't find the way to do it.
I have two vectors with several values, x and y and I want to do something to a vector depending on the value of r (r is the radius value after converting x and y to polar). In other words I would like to do something "like" (the command below does not work, but it will show what I want to do):
vector((cart2pol(x,y)[2])>5)=0
The problem is that "r" is the second output argument given by cart2pol and not be selected with the command above. Any idea about what could I do?
Thanks a lot for your help.
Salva

Interesting, but I guess that cannot be done in a single MATLAB line. Neither you can call an specific element of the first output!

% Let's see:
x = [1 2];
y = [2 3];
[a,b] = cart2pol(x,y);
% returns
% a = [1.1071 0.9828]
% b = [2.2361 3.6056]

% You can't get the a(2) with
cart2pol(x,y)(2) % error

% And much less you can't get the full b:
cart2pol(x,y)[2] % error

Anyway, by the way, as far as I know, when you call a function withing another one, the first output is only called:
sum(cart2pol(x,y))
% is equal to
sum(a)

Anybody?

carlos