how to initialize a variable with zero value ?

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yogesh jain
yogesh jain 2016-2-13
编辑： John D'Errico 2016-2-13
Hello all, I have one function which depends on two variables but it should not depend on the second variable until I change that variable. For example if two variables are x and y(x+y) then for functioning it should depend on x initially not on y. what should I do ? should I initialize y with zero value ? How to do that ?

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回答（1 个）

John D'Errico
John D'Errico 2016-2-13
编辑：John D'Errico 2016-2-13
Of course it still depends on y! It is just that y was zero in the example that you just set.
Perhaps you wish to set a default value for y, so that if y is not provided, then it uses zero? Learn to use nargin to test if a variable was not provided in a function call.
help nargin
For example...
function z = f(x,y)
if nargin < 2
y = 0;
end
z = y.*(x+y);
end

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