Stavros Macrakis wrote:
Don't know if this is the problem, but....
It is a bad idea to set data.frame <- xxx since R has a single
namespace for functions and variables.
That's not quite accurate. R mixes functions and variables in
namespaces, but it has lots of namespaces, and it usually doesn't cause
much trouble to have a variable named data.frame in one, and a function
named data.frame in another. The evaluator recognizes the context of
usage and will get the function for a function call. If you retrieve
data.frame without doing a function call, you'll get whichever one it
finds first, which is typically the one in the global environment, as
below. Sometimes this causes trouble (e.g. if you passed data.frame to
apply or do.call), but usually not, and I don't think it would cause
trouble below. What we see below is a simple misunderstanding of the
difference between [] and $.
Duncan Murdoch
-s
On 2/10/09, xinlee...@stat.math.ethz.ch <xinlee...@stat.math.ethz.ch> wrote:
Full_Name: Xin Lee
Version: 2.8.0
OS: Windows XP
Submission from: (NULL) (193.200.150.23)
Dear developer
I discover annoying bug in subsetting data frame. Here is reproducable
examples:
data.frame <- data.frame(x = runif(5), y = runif(5), row.names =
c('a','b','c','d','e')
subset <- data.frame['x']
subset['a',]
work
subset <- data.frame$x
subset['a',]
not work
subset <- data.frame['a',]
subset[,'x']
work
subset <- data.frame[,'x']
subset['a',]
not work
I hope this is easy fix for you and works corectly soon.
Sincerely,
Xin Lee
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