How can i set input command for undefined variable?

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Triveni
Triveni 2016-8-8
回答： Walter Roberson 2016-8-8
I have a input.
x_ang = [0 0 15 15 30, fliplr([0 0 15 15 30])];% [X,NN] = RunLength(x_ang);
it = 10; x=4;y=10;
if a comment on x_ang,
%x_ang = [0 0 15 15 30, fliplr([0 0 15 15 30])];% [X,NN] = RunLength(x_ang);
and if "x_ang" is not available, then i want to input automatically x_ang, then how can i make condition for this?

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采纳的回答

Walter Roberson
Walter Roberson 2016-8-8
if ~exist('x_ang', 'var')
x_ang = input('Enter x_ang values');
end

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