[R] Change names on dataset

[Uwe Ligges]

On 21.11.2011 11:40, Joel wrote:
> Hi fellow R users.
>
> I have a problem when i try to change the Names of the columns on a dataset:
> The names of the names dataset looks like this:
> toPlot
>
>> names(toPlot)
>   [1] "REPORT_20"      "REPORT_21"      "REPORT_22"      "REPORT_23"
>   [5] "REPORT_24"      "REPORT_25"      "REPORT_QREP001" "REPORT_RS010"
>   [9] "REPORT_RS011"   "REPORT_RS030"   "REPORT_RS090"   "REPORT_RS110"
> [13] "REPORT_RS120"   "REPORT_RS121"   "REPORT_RS122"   "REPORT_RS130"
> [17] "REPORT_RS131"   "REPORT_RS140"              "REPORT_RS141"
>
> Then I got an dataset with correspondent texts
>
>> text
>                 ID
> TEXT
> 1  REPORT_RS010_D
> Statusrapport
> 2  REPORT_RS011_D
> Ifyllnad
> 3  REPORT_RS030_D
> Export
> 4  REPORT_RS090_D
> Uppföljning
> 5  REPORT_RS110_D
> Guidelines
> 6  REPORT_RS120_D                            Korstabulering - en
> gruppvariabel
> 7  REPORT_RS121_D               Korstabulering - jämförelse med andra
> enheter
> 8  REPORT_RS122_D Korstabulering- två klassvariabler och jämförelse med
> andra
> 9  REPORT_RS130_D
> Sjukdomar
> 10 REPORT_RS131_D                              Sjukdomar och en
> gruppvariabel
> 11 REPORT_RS140_D
> Operationer
> 12 REPORT_RS141_D                             Operationer och en
> gruppvariabel
>
> I what i want is to change the names of toPlot with the real texts so I
> tried this:
> names(toPlot)[names(toPlot)=="REPORT_RS140"]<-text[text$ID==paste("REPORT_RS140","_D",sep=""),2];
>
> that gave me this strange result
>
>> names(toPlot)
>   [1] "REPORT_20"      "REPORT_21"      "REPORT_22"      "REPORT_23"
>   [5] "REPORT_24"      "REPORT_25"      "REPORT_QREP001" "REPORT_RS010"
>   [9] "REPORT_RS011"   "REPORT_RS030"   "REPORT_RS090"   "REPORT_RS110"
> [13] "REPORT_RS120"   "REPORT_RS121"   "REPORT_RS122"   "REPORT_RS130"
> [17] "REPORT_RS131"   "7"              "REPORT_RS141"
>
> As you can see I got the number 7 instead of the text and I dont know why.
> Can anyone spot the error?

Probably the entries in your "text" objects are factors which have been 
converted to numeric on the last assignment? Try to as.character() 
before doing these assignments if factors are inappropriate anyway.

Best,
Uwe Ligges


>
> //joel
>
>
>
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