MATLAB: How to use an integral inside another integral

Question

I have the following code:

function [answer]=find_integral2(z)
F=@(y) find_integral(z-y).*find_integral(y);
answer= integral(F,-Inf,Inf);
end
function [answer]=find_integral(u)
F = @(x)normpdf(x).*normpdf(u./x); 
answer= integral(F,-Inf,Inf);
end

When I call the function find_integral2(4), I get the following error:

Error using ./ Matrix dimensions must agree.

I know I can solve this with triple integral but I want to call find_integral2 several times, i.e. , I want to again use it in another function:

F=@(y) find_integral(z-y).*find_integral2(y);answer= integral(F,-Inf,Inf);

I would appreciate if you could help me fix this error. Thank you.

Answer 1

Either this (find_integral is unchanged)

function [answer]=find_integral2(z)
F=@(y) arrayfun(@(y)find_integral(z-y).*find_integral(y),y);
answer= integral(F,-Inf,Inf);
end

or this

function [answer]=find_integral2(z)
F=@(y) find_integral(z-y).*find_integral(y);
answer= integral(F,-Inf,Inf,'ArrayValued',true);
end