On Sat, 19 Feb 2011, David Winsemius wrote:
On Feb 19, 2011, at 4:50 PM, eric wrote:
I have a dataframe called x2. It seems to have a date column but I can't
access it or give it a name or convert it to a date. How do I refer to that
first column and make it a date ? When I try x2[1,] I get the second
column.
It is not actually a column but is rather a set of row names:
?rownames
rownames(x2)
More precisely, ?row.names for a DF: rownames is for a matrix. As
the help you quoted says
For a data frame, ‘rownames’
and ‘colnames’ eventually call ‘row.names’ and ‘names’
respectively, but the latter are preferred.
head(x2)
FAIRX SP500 delta
2000-08-31 0.010101096 0.007426964 0.002674132
2000-09-29 0.096679730 -0.054966292 0.151646023
2000-10-31 -0.008245580 -0.004961785 -0.003283795
2000-11-30 0.037024545 -0.083456134 0.120480679
2000-12-29 0.080042708 0.004045193 0.075997514
2001-01-31 -0.009042396 0.034050246 -0.043092643
x[1,1]
FAIRX
2000-08-31 0.01010110
x[1,2]
SP500
2000-08-31 0.007426964
str(x2)
'data.frame': 127 obs. of 3 variables:
$ FAIRX: num 0.0101 0.09668 -0.00825 0.03702 0.08004 ...
$ SP500: num 0.00743 -0.05497 -0.00496 -0.08346 0.00405 ...
$ delta: num 0.00267 0.15165 -0.00328 0.12048 0.076 ..
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David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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--
Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
______________________________________________
R-help@r-project.org mailing list
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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.
