Hi
I would like to write a script that reads a list of variable names. These
variable names are some of the column headers in a data.frame. Then I want do a
for-loop to execute various operations on the specified variables in the
data.frame, but can't figure out how to do the necessary variable substitution.
In bash (or C) I would use "$var", but there seems to be no equivalent in R.
The data.frame has 300 columns and 2500 rows. Not all columns are continuous
variables, some are factors, descriptors, etc., so I use the varlist to pick
which columns I want to analyze.
#Example script
varlist<-read.table(/path/to/varlist)
for (i in 1:length(varlist)){
res<-mean(Dataset$SOMETHINGHERE_i )
write(res) somewhere
}
Something like that. Any suggestions?
Thanks
Jon
Soli Deo Gloria
Jon Erik Ween, MD, MS
Scientist, Kunin-Lunenfeld Applied Research Unit
Director, Stroke Clinic, Brain Health Clinic, Baycrest Centre
Assistant Professor, Dept. of Medicine, Div. of Neurology
University of Toronto Faculty of Medicine
Kimel Family Building, 6th Floor, Room 644
Baycrest Centre
3560 Bathurst Street
Toronto, Ontario M6A 2E1
Canada
Phone: 416-785-2500 x3648
Fax: 416-785-2484
Email: jw...@klaru-baycrest.on.ca
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