How to add a variable that is not shown in workplace to the workplace?

Sometimes I write some functions but I cant see some of my variables in workplace after I run the code! Why this happens and how can I see them in workplace too?

for example this code doesn't show the "z" or "a" or "temp" or "p" in the workplace:

z = X * all_theta';
a = sigmoid(z);
[temp p] = max(a, [], 2);

Answer 1

[Stephen23]

"Sometimes I write some functions but I cant see some of my variables in workplace after I run the code!"

That is the expected behavior: every function has its own independent workspace:

https://www.mathworks.com/help/matlab/matlab_prog/base-and-function-workspaces.html

"Why this happens and how can I see them in workplace too?"

By far the simplest way to get variables from a function workspace into the base workspace is to pass them as output arguments, exactly as the MATLAB documentation recommends:

https://www.mathworks.com/help/matlab/matlab_prog/share-data-between-workspaces.html

For example:

function y = myfun(x);
y = sqrt(x)+2;
end

And tested:

>> out = myfun(16)
out = 6