[R] How to replace the values in a column

hannahmaohuang hannahmaohuang at gmail.com
Wed Feb 29 04:39:06 CET 2012

Dear All,
I've been searching relevant topics about replacing values, none seemed to
be applicable to me...

I have a file with many many varieties, and want to replace some of them
into different names. 
I tried various of ways, still don't know how to do that most efficiently..
Here is part of the example data:

Gen    Rep
A_1      1
A_1       2 
A_2     1
A_2     2
B_1       1
B_1       2
B_3       1
B_3       2
OP1_1   1
OP1_1   2
OP1_5   1
OP1_5   2

For example, I want to replace  A_1,  B_3,  OP1_1 into different name

So that the expected file should become:

Gen          Rep
Wynda      1
Wynda        2
A_2           1 
A_2           2
B_1              1
B_1             2
Wynda        1
Wynda        2
Wynda        1
Wynda        2
OP1_5          1
OP1_5         2

I have created a link file, which contains two rows, translating which Gen
correlating to which Name. Not sure if this file helps or not, example as

Column1(Gen)        Column2(Name)
A_1                               Wynda
A_2                                 A_2
B_1                                 B_1
B_3                             Wynda
OP1_1                       Wynda
OP1_5                        OP1_5

Though I can replace one by one in excel, since there are too many files and
too many reps, it'll be very time-consuming also easy to make mistakes.

Please give me any guidance or help in terms of finish this with R.

Thanks so much !


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