return multiple output variables from Matlab function

Matlab function outputs are in cell format, so you can define a cell data with the size same as the function output and use it as a single variable to store all the outputs in a more structured way :)

a = cell{3, 1};
[a{:}] = test(x, y, z);
A = a{1};
B = a{2};
C = a{3}; 

Some options:

Add a parameter to specify verbose output the console but set it to false by default:

function [ A, B, C ] = test(x, y, z, verbose)

   if nargin = 3
       verbose = false;
   end;

   A=2*x;
   B=2*y;
   C=2*z;

   if verbose
       fprintf('A = %f\nB = %f\nC = %f', A, B, C);
   end;

end

or combine them into one output:

function output = test(x, y, z)

   A=2*x;
   B=2*y;
   C=2*z;

   output = [A, B, C]; %// Or {A;B;C} if they're not going to be the same size, but then it won't display anyway

end

or if you really really want to I guess you could write a wrapper function that you call on your function and it displays all three for you that you could use generically on any function. But that hardly seems worthwhile.

Another option is to use assignin to automatically save an output argument to the workspace

function [ A, B, C ] = test(x, y, z)
    A=2*x;
    B=2*y;
    C=2*z;

    assignin('base', 'A', A);
    assignin('base', 'B', B);
    assignin('base', 'C', C);      
end

'base' is the name of the main workspace used when you call variables from the command window.

This way you can type test(x,y,z) into the workspace without the [A,B,C] = part and it will still give you all the values.

The benefit of this over combing A, B and C into one output is that you will still have 3 seperate variables saved in your workspace. This is useful if A, B and C are arrays or cells. A disadvantage of this method is that if you use this function inside another function it will still only use the value of A. For example: length(test(x,y,z)) will just give the length of A.