What does the character ~ mean in these code?

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Yu Zhang
Yu Zhang 2012-5-23
Hi all, I'm confused by the sentence as following:
[~,ind] = min(dist(:));
Could you tell me what does the character "~" mean in this code?
I appreciate your answer.
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Daniel Shub
Daniel Shub 2012-5-23
Related question: http://www.mathworks.co.uk/matlabcentral/answers/37858-the-sign-is-not-backwards-compatible

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the cyclist
the cyclist 2012-5-23
It is a "dummy" output, meaning that even though MATLAB normally generates that output, you know that you do not need it later in your code. In your particular case, you need the second output (the index), but you don't need the first output (the value of the minimum).
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Walter Roberson
Walter Roberson 2012-5-23
Note: older versions of MATLAB do not support this syntax. If your version of MATLAB reports an invalid operation at that point, then substitute any convenient temporary variable name for the ~ . For example,
[junk, ind] = min(dist(:));
clear junk

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