How to set mutually exclusive arguments in matlab?

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cui,xingxing
cui,xingxing am 16 Nov. 2020
Kommentiert: cui,xingxing am 17 Nov. 2020
How to use the new "arguments" parameter qualifier to control mutually exclusive two(or more) parameters as function inputs?
for example:
function out = twoStats(x,y)
arguments
% If you have input x, you cannot input y
% If you have input y, you cannot input x
end
end
similar question:
  1 Kommentar
Jon
Jon am 16 Nov. 2020
I have been looking through the documentation. It appears that the input validation only operates on a single argument at a time. I don't see any mechnisim for making the validation of one input dependent upon another, e.g. must be empty if b is not empty. Obviously you could check this yourself, but I understand that you want to use the new argument feature to do this

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Bruno Luong
Bruno Luong am 16 Nov. 2020
function out = twoStats(x,y)
arguments
x = [];
y {MustBeExclusive(x,y)} = [];
end
% out = ...
end
function MustBeExclusive(varargin)
if sum(cellfun('isempty',varargin)) ~= 1
eid = 'XY:NotExclusive';
msg = 'X and Y must be exclusive.';
throwAsCaller(MException(eid,msg))
end
end
  3 Kommentare
Steven Lord
Steven Lord am 17 Nov. 2020
>> twoStats([], 5) % x is the "placeholder" empty []
ans =
5
>> twoStats(1, []) % y is empty
ans =
[]
>> twoStats(1) % specify only x, let y take on its default value
ans =
[]
>> twoStats(1, 2) % neither is empty, this is not valid
Error using twoStats
Invalid argument at position 2. X and Y must be exclusive.
I would consider what the condition in MustBeExclusive should be carefully. If specifying both x and y as empties is allowed you should use == 0 instead of ~= 1. Should the following work? Currently it does not.
>> twoStats([], [])
Error using twoStats
Invalid argument at position 2. X and Y must be exclusive.
cui,xingxing
cui,xingxing am 17 Nov. 2020
Thanks, great!

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