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function where input is also output

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Marina
Marina on 22 May 2024
Commented: Marina on 23 May 2024
Is it possible to have a function where the argument is also calculated in the same function?
  4 Comments
Mathieu NOE
Mathieu NOE on 22 May 2024
ok then you can do it by iterations and hopefully it should converge , like
% start with initial values of flow and temperature
temp = ...
flow = ...
tol = 1e-3; % tolerance on result - whatever you want
while error > tol % repeat the loop until results have converged
temp_new = function1(flow); % update temperature (with function1)
flow_new = function2(temp_new); % update flow (with function2)
% compute error
error = abs(flow_new - flow) + abs(temp_new - temp); % other error metrics are possible, this is just one example
% update flow / temp
flow = flow_new;
temp = temp_new;
end

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Answers (2)

Star Strider
Star Strider on 22 May 2024
You can certainly return the input as an output if you want to.
A simple example —
x = 42;
[result_val, arg_val] = square_arg(x)
result_val = 1764
arg_val = 42
function [result_val, arg_val] = square_arg(x)
arg_val = x;
result_val = x.^2;
end
.

Kunal Kandhari
Kunal Kandhari on 22 May 2024
Hi Marina,
I understand that you are seeking to utilize pass-by-reference to modify the input argument passed into a function. The answer to the question depends on whether the input is a handle object or a value object.
The following MATLAB Answers post will explain how to achieve that:

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