call variables via evalin command into function

Hello I want to call some variable via 'evalin' into function. then I created z1 and z2 in workspace and save them into 'myfile8.mat'. then I created my function and named it 'ave1'. This is my function:

function[f]= ave1(z1,z2)

evalin('base','myfile8.mat');

load myfile8.mat

[n1,n2]=size(z1);

n3=n1*n2

[n4,n5]=size(z2);

n6=n4*n5

B=reshape(z1,n3,1);

C=reshape(z2,n6,1);

f=[B(:);C(:)]

end

when I ran 'ave1' in workspace I got this error:

Undefined variable "myfile8" or class "myfile8.mat".

Error in ==> ave1 at 2

evalin('base','myfile8.mat');

What is my problem and How can I solve it? Thanks

[José-Luis]

Why do you want to do that? Maybe I am misunderstanding but it strikes my as unnecessary. Why not just pass the variables you need to the function and get rid of evalin() altogether?

[fatema saba]

it is just an example. in my main problem I have a lot of big matrices as variables. I need to call them into variables via evalin.

[José-Luis]

My comment is still valid, I think. You could pass them all in a structure for instance.

[fatema saba]

Ok, How can I change my function please?