Grokbase Groups R r-help April 2016
FAQ
You never did provide a reproducible example or say how you wanted to
plot. Here is a way to get a subset of t1 or t2, and you can then use it
as input to ggplot:


library(dplyr)
your_subset <- df %>%
           mutate(key = grep(".*(t1|t2).*", "\\1", Command, value = TRUE))
%>%
           filter(!(Command %in% c('t1', 't2')))


This will give you a subset with just t1/t2 and you can use 'key' as the
colour option for ggplot.






Jim Holtman
Data Munger Guru


What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.


On Sat, Apr 23, 2016 at 4:16 PM, ch.elahe via R-help wrote:

Hi
I have the following df and I created two subsets but I don't know how to
use these subsets as the colors of my plot.


data.frame': 36919 obs. of 162 variables
$TE :int 38,41,11,52,48,75,.....
$TR :int 100,210,548,546,.....
$Command :factor W/2229 levels
"_localize_PD","_localize_tre_t2","_abdomen_t1_seq","knee_pd_t1_localize"...

and the subsets are names in Command which has t1 or t2 letters:



hast1=grepl("t1", df$Command, fixed=TRUE)
hast2=grepl("t2", df$Command, fixed=TRUE)


the colors I want in my plot are : hast1 and hast2
Thanks for any help.
Elahe

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