cheching exist Variable on the IF statment
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How to check the exist of the one variable that does not exist in if statment.
for example we have a function that need x,y variable, and we have a equation without y in it. if i run the Function it error the missing y,,,, i want to check that if it is not exist ,GIve it some value in the IF statment and then display that y is missing beside the error of the system...
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Do you mean the variable y is not defined or the variable y is missing from the function itself?
For example, is this the problem
x = 2;
z = x+y;
or is this the problem,
x = 2;
y = 3;
fun = @(x)x^2;
z = fun(x);
Better yet, provide a working example of what you're doing.
回答（1 个）
DGM
2021-5-3
Something like this
if ~exist('myvariable','var')
% set default value or error or whatever
end
Although using exist() during input handling is typically slower than methods using varargin
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2021-5-3
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