How to fix the error "Matrix dimensions must agree" in my code

I have the following two functions:

function [answer]=Sum_of_randomVariable(mean11,sigma11,mean12,sigma12,mean21,sigma21,mean22,sigma22,z)
A=@(x)FindIntegral(mean11,sigma11,mean12,sigma12,x);  
B=@(x)FindIntegral(mean21,sigma21,mean22,sigma22,x);  
F=@(y)A(z-y).*B(y);  
answer= integral(F,-Inf,Inf);
end

function [answer] = FindIntegral(mean1,sigma1,mean2,sigma2,u)
  F = @(x)normpdf(x, mean1, sigma1).*normpdf(u./x, mean2, sigma2).*(1./abs(x));
  answer= integral(F,-Inf,Inf);
end

When I run Sum_of_randomVariable for the following input parameters:

Sum_of_randomVariable(1,0.2,2,0.5,5,0.6,2,5,2)

I get the following error: Error using ./ Matrix dimensions must agree.

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

Answer 1

[Image Analyst]

Evidently x and u aren't the same size. Set a breakpoint there. What does it say their sizes are?

[may]

I set a breakpoint, the size of u is 1*150 double, but I cannot see the size of x.