When is output assigned from function?

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Max Frantz
Max Frantz 2021-4-21
评论： Max Frantz 2021-4-21
I want to understand how functions output the output variable.
For instance, I have the function below.
function A = myfun(X)
len = length(X)
A = zeros(len,1); %preallocate
for ind = 1:len
A = X(1:ind) * X(ind:end) %some operation
end
end
In a script, I call B = myfun(Y)
Does B get updated in the script workspace every time something happens to A? Is there any issue with making multiple assignments to A, or is something like this better:
function A = myfun(X)
len = length(X);
temp_A = zeros(len,1); %preallocate
for ind = 1:len
temp_A = X(1:ind) * X(ind:end); %some operation
end
A = temp_A;
end
Thank you

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回答（1 个）

Jan
Jan 2021-4-21
编辑：Jan 2021-4-21
Your first version is fine. When the function myfun() exists, the contents of A is replied as first output. The value of B is not accessed and not even existing during the function runs.
The temporary variable does not have any benefit in the 2nd version.

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