[R] replacing values in a vector

[Rolf Turner]

Boy are you confused.  This has nothing at all to do with substitution.

Instead do

	test <- with(fc,ave.fc[match(diff_mirs_list,Probe)])

	cheers,

		Rolf Turner

On 7/11/2008, at 11:46 AM, Iain Gallagher wrote:

> Hello list.
>
> I have a vector of values:
>
> eg
>
>> head(diff_mirs_list)
> [1] "hsa-miR-26b" "hsa-miR-26b" "hsa-miR-23a" "hsa-miR-27b" "hsa- 
> miR-29a"
> [6] "hsa-miR-29b"
>
> and I would like to conditionally replace each value in this vector  
> with a number defined in a dataframe:
>
>> fc
>              Probe ave.fc
> 1       hsa-let-7a   1.28
> 2      hsa-miR-100   1.47
> 3  hsa-miR-125a-5p   1.31
> 4   hsa-miR-140-3p   1.28
> 5      hsa-miR-143   1.98
> 6  hsa-miR-193a-3p   1.37
> 7     hsa-miR-193b   1.48
> 8      hsa-miR-195   1.16
> 9      hsa-miR-214   1.22
> 10     hsa-miR-23a   1.21
> 11     hsa-miR-26b   1.13
> 12     hsa-miR-27b   1.37
> 13     hsa-miR-29a   1.24
> 14     hsa-miR-29b   1.69
> 15     hsa-miR-30b   1.16
> 16     hsa-miR-424   1.42
> 17  hsa-miR-768-3p   1.48
> 18  hsa-miR-886-3p   1.43
> 19     hsa-miR-933   1.23
>
> ie every hsa-let-7a in the diff_mirs_list is replaced by 1.28, hsa- 
> miR-100 by 1.47 etc etc
>
> I have tried to make a loop to use gsub eg
>
>> for (i in 1:nrow(fc)){
> + test<-gsub(fc[i,1], fc[i,2], diff_mirs_list)
> }
>
> but this obviously passes the unchanged vector to gsub each time  
> and so I get back my 'test' vector with only hsa-miR-933 changed.  
> Could someone help me out with this please.

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