How does tilde remove NaN's from dataset?
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Ralph
el 3 de Mzo. de 2014
Comentada: Ralph
el 3 de Mzo. de 2014
Given a C = m x n matrix of 1's and 0's, and a data set B = r x s with NaN's mixed in with numeric data, how do I use the tilde to remove the NaN's? I have seen this in an example:
A=B(~C,:); and it worked in the example.
I cannot recreate it in a different problem. I also cannot find any explanation in any Mathworks information that explains it.
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Walter Roberson
el 3 de Mzo. de 2014
You are not applying ~ to the NaNs, you are applying ~ to the matrix of 0 and 1. ~ is logical negation, so all the places in C that were 0 become "true" (1) and all the places in C that were anything else become "false" (0). That matrix of true and false is then used "logical indexing". You can read about that Steve's Blog
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