??? Undefined function or variable 'swap'.
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回答（3 个）
There is no need to write your own function: if you want to swap variables, then you can use the inbuilt deal function to do exactly this:
>> X = 3;
>> Y = 2;
>> [Y,X] = deal(X,Y)
Y =
3
X =
2
It even works for multiple arguments!
Walter Roberson
2015-6-12
function [y,x]=swap(x,y)
end
is the entire code. To use it, for example,
a = 5; b = 48;
[a,b] = swap(a,b)
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