How can i use If ... else loop inside function ?

Hi, i have a problem says :

Output argument ( and maybe others) not assigned during call to " g ". Here the function of g

%% Drichlet condition : u.n=g(x,y) in the boundary
function z= g(x,y,time)
if x==0
    nx=-1
    ny=0
    
    z=exp(-time).*sin(pi*x).*sin(pi*y);
end

if x==1
    nx=1
    ny=0
    
    z=exp(-time).*sin(pi*x).*sin(pi*y);
end

if  y==0
    nx=0
    ny=-1
    
    z=exp(-time).*sin(pi*x).*sin(pi*y);
end

if  y==1
    nx=0
    ny=1
    
    z=exp(-time).*sin(pi*x).*sin(pi*y);
end
end

[waqas]

What is the input that you are giving for g? Seems like you are giving both x and y at the same time and the conditions are not satisfied for if loop.

Answer 1

[Fangjun Jiang]

If none of those conditions are met, you end up with z not assigned.

give z a default value at the begining.