Corrcoef creating NaNs from datasets with no NaNs
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I have been trying to analyse correlations between temperature and pressure fields or a temperature field and a time series and for some reason even though neither the temperature or pressure datasets have any NaNs in them corrcoef is producing NaNs.
What reasons are there for this to happen?
The NaNs that are being produced are propagating through my program and causing problems with the output.
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Answers (2)
Youssef Khmou
on 24 Sep 2013
hi, because your data contain similar values, here is an example :
corrcoef([ones(4,1) ones(4,1)])
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Sean de Wolski
on 24 Sep 2013
corrcoef(zeros(10,1),zeros(10,1))
They'll occur from 0/0 or inf/inf
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Sean de Wolski
on 24 Sep 2013
Edited: Sean de Wolski
on 24 Sep 2013
It's hard to say without seeing the data. You could run the following and then run your code:
dbstop if naninf
Which will stop with the debugger when the NaN is calculated and you can inspect what's going on.
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