Question on function variables i.e. ~
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[~,I] = max(abs(xc));
This is code taken from an example in MATLAB. I read somewhere that ~ can be used to indicate 'don't care' variables - variables that are not required in further program.
I could have used some variable name, say a, instead of ~, and ignore a. What is the advantage if you use ~. Is it saving space by not storing the data not required?
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James Tursa
am 17 Dez. 2015
Bearbeitet: James Tursa
am 17 Dez. 2015
It is mainly to avoid cluttering your workspace with variables you don't need in a "neat" manner. E.g.,
[~,I] = max(abs(xc));
does the same thing as:
[M,I] = max(abs(xc));
clear M
In both cases, the first output argument is still calculated and returned by the function. Using ~ simply saves you, the programmer, the trouble of clearing unwanted variables manually (MATLAB will do it for you in the background).
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