R help - Sep 2008 - Save object summary to file

Hi,

Am wanting to save the summary of a PCA to file.

Have tried:
> write.table(summary(PCA), file="PCAvar.txt", sep="\t")
but receive:

Error in as.data.frame.default(x[[i]], optional = TRUE, stringsAsFactors
stringsAsFactors) :
  cannot coerce class "summary.princomp" into a data.frame

What am I doing wrong?

Thanks


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Hi,

The returned value of summary.princomp() is NOT a data.frame and
cannot be coerced into a data.frame (it's a list), so you cannot write
it into a file using write.table().

I guess what you really intend to write is:

#################################################################
x <- summary(PCA)
vars <- x$sdev^2
vars <- vars/sum(vars)
write.table(rbind("Standard deviation" = x$sdev, "Proportion of
Variance" = vars,
        "Cumulative Proportion" = cumsum(vars),
file="PCAvar.txt", sep="\t")
#################################################################

Yihui

On Fri, Sep 12, 2008 at 7:51 AM, pgseye <prseye at gmail.com>
wrote:
>
> Hi,
>
> Am wanting to save the summary of a PCA to file.
>
> Have tried:
>
>> write.table(summary(PCA), file="PCAvar.txt",
sep="\t")
>
> but receive:
>
> Error in as.data.frame.default(x[[i]], optional = TRUE, stringsAsFactors
> stringsAsFactors) :
>  cannot coerce class "summary.princomp" into a data.frame
>
> What am I doing wrong?
>
> Thanks
>
>

-- 
Yihui Xie <xieyihui at gmail.com>
Phone: +86-(0)10-82509086 Fax: +86-(0)10-82509086
Mobile: +86-15810805877
Homepage: http://www.yihui.name
School of Statistics, Room 1037, Mingde Main Building,
Renmin University of China, Beijing, 100872, China

Thanks Yihui and to others who replied privately.

Very helpful information.

Regards,

Paul


pgseye wrote:
> 
> Hi,
> 
> Am wanting to save the summary of a PCA to file.
> 
> Have tried:
> 
>> write.table(summary(PCA), file="PCAvar.txt",
sep="\t")
> 
> but receive:
> 
> Error in as.data.frame.default(x[[i]], optional = TRUE, stringsAsFactors
> stringsAsFactors) :
>   cannot coerce class "summary.princomp" into a data.frame
> 
> What am I doing wrong?
> 
> Thanks
> 
> 
> 
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