Loop over several Variables, add on question
In Line John Kane Kingston ON Canada
-----Original Message----- From: bochristoph at web.de Sent: Fri, 2 Nov 2012 05:34:48 -0700 (PDT) To: r-help at r-project.org Subject: Re: [R] Loop over several Variables, add on question Hey Petr, thanks for answering. First to your question: I use rename from the reshape package. You are probably right to assume that I do not have a to extensive reading background in R - basically I had to dive right in (which probably isn't a good idea, but I could not change that). Having a solid background in other statistics packages (stata, SPSS) I now find myself putting quite a lot of effort into presumably easy to do things like recoding, merging, looping etc.
A solid background is SAS, & SPSS is a disadvantage in using R. I assume that the same applies for Stata. Google for "R for sas and spss users pdf" and read Bob's short comparison of the differences to look out for. An even better alternative but which may take longer is to get his book. http://onlinelibrary.wiley.com/doi/10.1111/j.1751-5823.2012.00179_24.x/abstract . Moving from the older stats packages to R is often mindrwrenching. After Bob's book you probably need to at least skim "Introduction to R" .
(I really dont want to mention how long it took me to get that
recode
done in the first place ...). So in any case I am sorry if I am bothering
you with somewhat strange problems...
Nevertehless even though your proposed solution did work 'as is' it did
not
when I remodelled it to my data
vec<-paste0("y", 1:5)
ti[grep("y",vec)]<- paste0("tiy", 1:5)
It did produce no error message but the variable names did not change.
Could
the problem be that ti in my case is not a vector but a dataframe (the
y's
being variables in that dataframe?)
All the best
Bernhard
--
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