Sorry about that, this is my first time posting. Below is the complete post.
========================
I am trying to run the R Script below, I have actually simplified it to just
this part that is causing issues. When I run this script I continue to get an
error that says "cannot rescale a constant/zero column to a unit variance". I
cannot figure out what is going on here. I have stripped down my data file so
it is more manageable so I can try to figure this out.
The data.txt file that is being read looks like this:
UserID,Q1,Q2
2342,3,2
I have made this file very basic on purpose to see if I could get this to work,
but it is not working. Of course once I get this to actually work I will
expand the data file to match the data I am actually using.
library(stats)
mydata <- read.table("data.txt", header=TRUE, sep = ",")
newdata <-na.omit(mydata)
pcdata <- newdata[c(-1)]
pcmatrix <- data.frame(pcdata)
# Add the difference so the totals in the scale = 100
pcmatrix[,1] <- pcmatrix[,1] + 96
pcmatrix[,2] <- pcmatrix[,2] + 96
x.pca <- prcomp(pcmatrix, retx=TRUE, center=TRUE, scale=TRUE, cor=TRUE)
weight <- cbind(round(abs(x.pca$rotation[,1]),3))
write.table(weight,file="weights.txt")
If I change the attribute in the prcomp function to scale=FALSE of course I can
run my script. But if it is scaling...which is causing the issues, it errors.
Any help would be GREATLY appreciated.
========================
On Oct 31, 2012, at 10:54 AM, David Winsemius wrote:
>
> On Oct 31, 2012, at 5:47 AM, fillay89 wrote:
>
>> I am trying to run the R Script below,
>
> There is no script (or data description) appearing in this posting to the
> Rhelp Mailing List. Nabble is not Rhelp, despite Nabble's effort to get you
> to think it is an archive. Please review the Posting Guide that I know you
> were offered when you posted from Nabble.
>
> Yes, we could view this in Nabble, but most of us choose not to do so. This
> is a technical mailing list, not a website or chat-room.
> --
> David.
>
>
>> I have actually simplified it to just
>> this part that is causing issues. When I run this script I continue to get
>> an error that says "cannot rescale a constant/zero column to a unit
>> variance". I cannot figure out what is going on here. I have stripped down
>> my data file so it is more manageable so I can try to figure this out.
>>
>> The data.txt file that is being read looks like this:
>>
>>
>> I have made this file very basic on purpose to see if I could get this to
>> work, but it is not working. Of course once I get this to actually work I
>> will expand the data file to match the data I am actually using.
>>
>>
>>
>> If I change the attribute in the prcomp function to scale=FALSE of course I
>> can run my script. But if it is scaling...which is causing the issues, it
>> errors.
>>
>> Any help would be GREATLY appreciated.
>>
>>
>>
>> --
>> View this message in context:
>> http://r.789695.n4.nabble.com/Cannot-rescale-a-constant-zero-column-error-tp4647996.html
>> Sent from the R help mailing list archive at Nabble.com.
>>
>> ______________________________________________
>> R-help@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
> David Winsemius, MD
> Alameda, CA, USA
>
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