Hello,
Inline
Em 05-07-2012 20:21, Nordlund, Dan (DSHS/RDA) escreveu:
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-bounces@r-
project.org] On Behalf Of Rich Shepard
Sent: Thursday, July 05, 2012 11:29 AM
To: r-help@r-project.org
Subject: Re: [R] reshape2 errors on data frame
On Thu, 5 Jul 2012, Rich Shepard wrote:
I wonder if the issue is with the logical columns; I've not used
them
before, only dates, factors, and numerals. I'll try without the
logicals
and see if there's a difference.
Nope. Same problem as before.
Someone, please provide a process I can apply to figure out the
error in
the data frame.
Rich
Rich,
I apologize that I did not read your original post carefully enough. I missed that your
problem was with the dcast() function. I am not very familiar with the reshape package,
but maybe I can give you some ideas of how to proceed. When I ran your melt syntax there
was no error message, however there was a messages saying "Using site, sampdate,
param as id variables". That is, not all of the ID variables specified were used.
So the chem.melt data frame did not have all the ID variables in it. Therefore, when I
tried to run the dcast() syntax that you gave, it could not find some of variables
specified. In your case, the error message stated that it could not find sampdate. If
you run
I should have said that in my earlier post. It's implicit in the
misspeling of the argument 'id.vars', an argument of melt() not of
dcast(). Therefore, melt() issues a warning, the warning in the OP.
I'll reproduce it here:
> chem.melt <- melt(waterchem,
+ idvars = c('site', 'sampdate', 'preeq0', 'param', 'ceneq1', 'floor',
'ceiling'))
Using site, preeq0, param, ceneq1 as id variables
Hope this helps,
Rui Barradas
str(chem.melt)
do you see the variable sampdate? I am not sure how you are wanting to
re-shape your data, but when you specify a variable in dcast(), it needs to be
in the dataframe you are working with.
Dan
Daniel J. Nordlund
Washington State Department of Social and Health Services
Planning, Performance, and Accountability
Research and Data Analysis Division
Olympia, WA 98504-5204
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