[BioC] merge two dataframes

[Sean Davis]

On Tuesday 13 February 2007 04:29, Ghislaine Guigon wrote:
> Hi,
>
> I would try to merge 2 dataframes x1, x2 with same structure. ID is the
> common columns. I don't understand why the result,  x,  is composed of NA ?
> Is someone understand the problem ?
>
> The code is :
>  > x2[1:3,]
>
>               ID     sVOL logSignalMean
> 4340 8559;27*L11 3189.818    11.6392584
> 4335  8547;27*L9 3419.657    11.7396359
> 3267 6441;27*I18    0.000    -0.4460873
>
>  > x1[1:3,]
>
>               ID     sVOL logSignalMean
> 4339 8557;25*L11 2972.267    11.5373480
> 4334  8545;25*L9 3380.747    11.7231263
> 3266 6439;25*I18    0.000    -0.4460873
>
>  > x<- merge(x1,x2,by.x=ID,by.y=ID,suffixes=c("1","2"))

The by argument needs to be a number, a logical vector, or character.  You are 
supplying a variable which is being interpreted as one of these.  Change the 
statement to:

x<- merge(x1,x2,by.x="ID",by.y="ID",suffixes=c("1","2"))

That will probably get you the answer you want.

>  > x[1:3,]
>
>        ID sVOL1 logSignalMean1 sVOL2 logSignalMean2
> NA   <NA>    NA             NA    NA             NA
> NA.1 <NA>    NA             NA    NA             NA
> NA.2 <NA>    NA             NA    NA             NA
>
> thanks,
> gg