[R] help with text patterns in strings

[arun]

Hi,
May be this helps:

dat1<- data.frame(Ans=c("Friday","Wednesday","Friday,Saturday,Sunday","Saturday","Sat,Sun","Th,F,Sa"),stringsAsFactors=FALSE)
 dat1
                     Ans
1                 Friday
2              Wednesday
3 Friday,Saturday,Sunday
4               Saturday
5                Sat,Sun
6                Th,F,Sa


 vec1<- c("Su","M","Tu","W","Th","F","Sa")
 vec2<-unlist(strsplit(dat1$Ans,","))

vec2

 #[1] "Friday"    "Wednesday" "Friday"    "Saturday"  "Sunday"    "Saturday" 
 #[7] "Sat"       "Sun"       "Th"        "F"         "Sa"      
sapply(vec1,function(x) length(vec2[grep(x,vec2)]) )
#Su  M Tu  W Th  F Sa 
# 2  0  0  1  1  3  4 

A.K.


----- Original Message -----
From: bcrombie <bcrombie at utk.edu>
To: r-help at r-project.org
Cc: 
Sent: Monday, June 17, 2013 1:59 PM
Subject: [R] help with text patterns in strings

Let’s say I have a data set that includes a column of answers to a question
“What days of the week are you most likely to eat steak?”.
The answers provided are [1] “Friday”, [2] “Wednesday”, [3] “Friday,
Saturday, Sunday", [4] "Saturday”, [5] “Sat, Sun”, [6] “Th, F, Sa” 
How can I tell R to count “Friday, Saturday, Sunday”, “Sat, Sun”, and “Th,
F, Sa” as three separate entries for each unique observation?
And is there a way to simultaneously tell R that, for example, “Friday” is
the same as “Fri” or “F”; “Saturday” is the same as “Sat” or “Sa”; etc.?
Thanks for your assistance.




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