Re: [R] Help on Principal Component Analysis in R

Hi, it could also be that during reading your csv the matrix became a character matrix. Try str(x); this should show you if your values are seen as numeric. Also, if you have descriptive columns (e.g. date, labels, etc.) they must be removed before calculating PCR. With best regards Brandstätter

Re: [R] Help on Principal Component Analysis in R

Hi error message indicates that you have non numeric value in your table/ matrix. Replace missing value by NA and add na.rm= true in your command prcomp. Karim Le 14 janv. 2015 00:27, R Help! emanek...@gmail.com a écrit : Hello! I am a beginner to R. I have read several guides, but still am

[R] Help on Principal Component Analysis in R

Hello! I am a beginner to R. I have read several guides, but still am stuck on this: I have data in an excel csv file, on which I want to run PCA. I'm not sure how the prcomp formula works. The help page states: prcomp(x, retx = TRUE, center = TRUE, scale. = FALSE, tol = NULL, ...) what is x

Re: [R] Help on Principal Component Analysis in R

I'd you keep reading the help file, the answer to your question is right there. As for step by step... only you know what your data looks like. There are various pitfalls one can encounter in getting data from a file into an object in memory, but the basic idea is to use the read.csv function,