Question: (Closed) recoding genotype in R
gravatar for Fersal
5 months ago by
Fersal20 wrote:

I am trying to re-code the following genotype data frame from biallelic code to "A", "B" code. corresponding to P1 and P2, respectively, which in turns correspond to the two parents. Please consider the following example.

SNP P1  P2  in1 in2 in3 in4
M01 CC  GG  CC  GG  CC  GG
M02 TT  CC  TT  TT  CC  TT
M03 AA  GG  AA  GG  GG  GG
M04 CC  GG  CC  GG  CC  GG
M05 GG  AA  AA  GG  AA  AA
M06 CC  GG  CC  GG  CC  CC

So that all the individuals that have the same genotype of P1 would be "A" and the ones that carries the genotype from P2 would be "B". Like the following table:

SNP P1  P2  in1 in2 in3 in4
M01 CC  GG  A   B   A   B
M02 TT  CC  A   A   B   A
M03 AA  GG  A   B   B   B
M04 CC  GG  A   B   A   B
M05 GG  AA  B   B   B   B
M06 CC  GG  A   B   A   A

I have tried the following code in R

df[[4:7]) == as.character(df$P1)] = "A"
df[[4:7]) == as.character(df$P2)] = "B"

Error in `[<`(`*tmp*`,[4:7]) == as.character(df$P1),  : 
  unsupported matrix index in replacement

Any idea how to solve it?

recode genotype R • 280 views
ADD COMMENTlink written 5 months ago by Fersal20

Hello Fersal!

We believe that this post does not fit the main topic of this site.

This is an R question and has nothing to do with the data involved. Please read up on how to index 2 dimensional objects in R

For this reason we have closed your question. This allows us to keep the site focused on the topics that the community can help with.

If you disagree please tell us why in a reply below, we'll be happy to talk about it.


ADD REPLYlink written 5 months ago by RamRS21k
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