On Jul 30, 2010, at 2:12 PM, Cadmium 2 wrote:
Hi to you all!
I'm new to R and to this mailing list, so do please excuse me if my
question
sounds stupid.
Currently I'm working with a data frame called "results".
In each column of "results" I have a set of results for different
experiments (all results are numerical) realized in different
dates, so
that each row corresponds to a day.
To make it clear when displaying the results, I gave names to the
columns
with the names of the experiments realized. I also gave names to the
rows
based on the day the experiments where realized.
My problem now is that I'm trying to separate this experiments based
on a
criteria that is not important for the moment. What I want to be
able to do
is, given an experiment name, obtain the time series of the results
of that
experiment.
I know I can do this by typing
results$nameoftheexperiment
But what if I have a variable "name" which contains the experiment's
name?
Doing the following
results$name
doesn't work, as expected, since there is no column with name name.
Try:
results[ , name]
And read the the help page for ?Extract. The $ formalism does not
evaluate its argument whereas the [ function does.
--
David.
Any help would be appreciated.
Thank you very much!
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David Winsemius, MD
West Hartford, CT
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
