MATLAB: Cart to cyl (getting error of Not enough input arguments.)

function

function [Pcyl] = cart2cyl(Pcart)
% input and output as 3 by 1 vectors
x=Pcart(1);
y = Pcart(2);
z= Pcart(3);
rho= sqrt(x^2+y^2);
if x,y >= 0
    phi = atan(y/x);
elseif x,y < 0
    phi = atan(y/x)+pi;
elseif (x>0) && (y<0)
    phi = 2*pi-atan(y/x);
else 
    phi = pi-atan(y/x);
end
Pcyl= [rho phi z]';
end

Best Answer

Dont run the function using run/ green button. You define the values of inputs in the workspace and then call the function. 
Pcart = rand(1,3) ; 
Pcyl = cart2cyl(Pcart)
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