Hello,
To do what you want, see ?toupper :
levels(dat$target) <- toupper(levels(dat$target))
However, for clarity,
dat$target is not a "string variable", it is a factor,
which you can verify with
> str(dat)
Factors are enumerated types, and have a discrete
set of 'levels' associated with them,
which can be queried with the ?levels function.
'Behind the scenes', R is storing this variable
as numeric codes, not the character string associated
with each numeric code.
This contrasts with character vectors.
--Erik
Jahan wrote:
Hello,
Here is the data set I am working with:
dat=read.csv('http://dl.dropbox.com/u/1852742/relexpressions.csv')
names(dat)
#Under the 'target' column, I want to change all of the values into
all capital letters (e.g. fgf2 becomes FGF2). I have taken a loop
approach but I think my Python background is confusing me. Here is
what I attempted:
for(line in dat[,1]){if(line=='fgf2'){line<-'FGF2'}}
#I made sure that it was looping through each line by entering:
for(line in dat[,1]){if(line=='fgf2'){print(line)}} #Which did exactly
what I thought it would.
#This doesn't change anything, though. Also, after reading the
documentation I am still confused how to add multiple "if"
statements. I would need that because I need to change the names of
fgf2, fgf7, and fgf10.
#I am sure there is a built-in function to do what I need, but I
haven't found it yet so I tried this loop method. Any help is greatly
appreciated!
Jahan
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