Check for optional inputs in a function using exist

29 vues (au cours des 30 derniers jours)
Haris K.
Haris K. le 28 Oct 2020
Hi everyone. Is it wrong, prone to mistakes, or slower to check the existance of optional arguments in a function using exist()? For the purposes of the illustration, assume I have 2 required and 1 optional inputs named r1,r2 and op1, respectively.
function y = mafun(r1,r2,op1)
if ~(exist('op1', 'var')==1)
op1 = 'smthn';
end
%do smthn with r1,r2 and op1 (when needed)
end
  1 commentaire
Walter Roberson
Walter Roberson le 28 Oct 2020
if ~exist('op1', 'var')
op1 = 'smthn';
end
would be cleaner.

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Walter Roberson
Walter Roberson le 28 Oct 2020
I suspect that it is faster to check nargin.
Note: starting R2019b, it is possible to use an "arguments" block to do automatic default values.

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