How to get multiple outputs from a function?
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Jongwu Kim
il 10 Gen 2020
Commentato: Jhon Onill
il 5 Mar 2023
Hi, I'm using the latest version of MATLAB and trying to get 2 mulitple outputs from the simple function below.
function [x,y] = subfuntest(a,b)
x = a - b; y = a + b;
end
After I save it to an m-file, I typed subfuntest(1,2) in the command window and it only shows -1, which is the outcome of x.
How can I get both x and y, instead of just get x?
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John D'Errico
il 10 Gen 2020
Modificato: John D'Errico
il 10 Gen 2020
[x,y] = subfuntest(a,b);
When you call it with no arguments, it returns only the first, putting it in the default variable name of ans, then dumping the other arguments into the bit bucket.
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Steven Lord
il 10 Gen 2020
Retrieving two outputs from a function requires two steps.
- Define the function to return two outputs
- Call the function with two outputs
You've performed the first of those steps. Your function definition states that it returns two outputs, the contents of the variables x and y created inside your function.
function [x,y] = subfuntest(a,b)
Now you (or really the user of your code, which could be you or could be someone with whom you share the code) need to perform the second step: call the function with two outputs.
[abra, cadabra] = subfuntest(1, 2)
Calling it with one output would only get the first input (unless the function author took specific steps to make it behave otherwise. But that's a little more of an advanced maneuver. You didn't take those steps in your code.)
hocuspocus = subfuntest(1, 2) % hocuspocus has the same contents as abra
subfuntest(1, 2) % ans has the same contents as abra and hocuspocus
3 Commenti
Steven Lord
il 29 Giu 2021
As long as the function is defined to accept one or more input variables (and be callable with just one input) and return two or more outputs (and be callable with just two outputs) that's fine.
callWithOne = squareAndCube(1:5)
[callWithTwo1, callWithTwo2] = squareAndCube(1:5)
function [x2, x3] = squareAndCube(x)
% This function accepts up to one input argument.
% This function REQUIRES at least one input argument.
%
% This function returns up to two output arguments.
%
% The first output is the square of the input.
% The second output is the cube of the input.
x2 = x.^2;
x3 = x.^3;
end
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