Somehow, my data is still getting mangled.
Running the SVM gives me the following error:
"names" attribute[1994] must me the same length as the vector[1950]
Any thoughts?
-N
On 8/2/09 2:35 PM, (Ted Harding) wrote:
> On 02-Aug-09 21:10:12, Noah Silverman wrote:
>
>> Hi,
>> I am reading in a dataframe from a CSV file. It has 70 columns.
>> I do not have any kind of unique "row id".
>>
>> rawdata<- read.table("r_work/train_data.csv", header=T, sep=",",
>> na.strings=0)
>>
>> When training an svm, I keep getting an error
>> So, as an experiment, I wrote the data back out to a new file
>> so that I could see what the svm function sees.
>>
>> write.table(rawdata, file="r_work/output_data.csv",
>> quote=FALSE, sep=",")
>>
>> It appears as if R has added a column for me with id numbers
>> for each row. That would be fine, except that R SHIFTS ALL MY
>> COLUMN LABELS OVER ONE. That causes several problems:
>> 1) The header names are now wrong for each column
>> 2) My last column has no label
>> 3) The SVM complains about the unlabeled column
>>
>> Would someone please help me sort this out.
>> Thanks!
>> -N
>>
> Not that the default for "row.names" in write.table() is TRUE.
> So. in your caoomand, that is what you get. write.table() then
> *creates* row-names (by default the row numbers). Compare:
>
> D<- rbind(c(1.1,1.2,1.3),c(2.1,2.2,2.3),c(3.1,3.2,3.3))
> D
> # [,1] [,2] [,3]
> # [1,] 1.1 1.2 1.3
> # [2,] 2.1 2.2 2.3
> # [3,] 3.1 3.2 3.3
>
> write.table(D,file="withTRUE.csv",quote=FALSE,sep=",")
> # withTRUE.csv:
> # V1,V2,V3
> # 1,1.1,1.2,1.3
> # 2,2.1,2.2,2.3
> # 3,3.1,3.2,3.3
>
> write.table(D,file="withFALSE.csv",row.names=FALSE,quote=FALSE,sep=",")
> # withFALSE.csv:
> # V1,V2,V3
> # 1.1,1.2,1.3
> # 2.1,2.2,2.3
> # 3.1,3.2,3.3
>
> Hoping this helps,
> Ted.
>
> --------------------------------------------------------------------
> E-Mail: (Ted Harding)<ted.hard...@manchester.ac.uk>
> Fax-to-email: +44 (0)870 094 0861
> Date: 02-Aug-09 Time: 22:35:04
> ------------------------------ XFMail ------------------------------
>
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