maechler at stat.math.ethz.ch
Wed Apr 30 13:56:43 CEST 2003
>>>>> "Martin" == Martin Wegmann <wegmann at biozentrum.uni-wuerzburg.de>
>>>>> on Wed, 30 Apr 2003 11:40:40 +0200 writes:
Martin> Hello, I tried to compute a PCA of values derived
Martin> from satellite imagery but with princomp I get the
Martin> following output:
>> pca.late <- princomp(late, na.action=na.fail)
Martin> Error in cov.wt(z) : x must contain finite values only
Martin> the datasets are values from satellite imagery,
Martin> therfore I assume they are finite. But if not is
Martin> there a way to minimize the decimal place?
Martin> I tried prccomp as well but I don't understand this
Martin> output at all and I can't add "na.action=na.pass"
Martin> what I thought could be the problem.
Martin> Error in svd(x, nu=0) : NA/NaN/Inf in foreign function call (arg 1)
Martin> any idea how to fix it?
As Christian has suggested, look at your data. I'm sure there
are non-finite values.
To find these, quickly, you can use
which(!is.finite(data.matrix(late)), arr.ind = TRUE)
which will give you the row and column numbers of the non-finite
Hoping this helps,
Martin Maechler <maechler at stat.math.ethz.ch> http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum LEO C16 Leonhardstr. 27
ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND
phone: x-41-1-632-3408 fax: ...-1228 <><
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