[R] how to sort a data.frame by ascending some columns

[Henrique Dallazuanna]

clones.info[order(clones.info$CHROMOSOME),]

-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O


On 18/11/2007, affy snp <affysnp at gmail.com> wrote:
> Dear list,
>
> I have a data frame (238304 rows and 6 columns). I want the data frame
> sorted by two columns in ascending order. I am showing
> the first 5 rows of the data frame
>
> > clones.info[1:5,1:6]
> USER_CLONE_ID  CHROMOSOME  Expr1002  KB_POSITION  Allele_A  WELL_ID
> 1 SNP_A-1855402 17 41419603 41419603 C rs17572851
> 2 SNP_A-4249904 17 41420045 41420045 A rs17572893
> 3 SNP_A-2174835 18 41407760 41407760 C rs17651213
> 4 SNP_A-1880271 18 41173993 41173993 A rs17563827
> 5 SNP_A-2313232 17 41169023 41169023 C rs17563787
>
> Especially, I want the data frame sorted by column CHROMOSOME
> first and then by KB_POSITION. Both in ascending orders.
>
> So after sorting, it should looks like:
> > clones.info[1:5,1:6]
> USER_CLONE_ID  CHROMOSOME  Expr1002  KB_POSITION  Allele_A  WELL_ID
> 1 SNP_A-2313232 17 41169023 41169023 C rs17563787
> 2 SNP_A-1855402 17 41419603 41419603 C rs17572851
> 3 SNP_A-4249904 17 41420045 41420045 A rs17572893
> 4 SNP_A-1880271 18 41173993 41173993 A rs17563827
> 5 SNP_A-2174835 18 41407760 41407760 C rs17651213
>
> I looked at the R manual and found order() can be used to sort a
> vector or data frame but only for one vector. Is it possible to
> sort by two columns using order() or some other functions in
> R?
>
> Thanks a lot!
>        Allen
>
>         [[alternative HTML version deleted]]
>
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