Not knowing what processdata() does or whether it has any outputs at all, I can't say.
When you define a function, define its input arguments and output arguments. If you don't have any output arguments, then you don't have anything to pass to another function (unless you're abusing globals or using nested functions with shared variables).
This is a basic example of two functions:
% take the output from one function
intermediateresult = addnumbers(3,4)
% and pass it to another
finalresult = multiplynumbers(intermediateresult,3)
% function is defined with input arguments and output arguments
function out = addnumbers(A,B)
out = A+B;
end
% again, function has input and output arguments
function out = multiplynumbers(A,B)
out = A.*B;
end
The result is (3+4)*3=21
The two functions are independent scopes. A,B in the first function are not the same conceptual entities as the A and B in the second function. They exist only in their respective scope.
