Yeah, sometimes the vocabulary we bring to a task does not match up
(or "merge" properly) with the vocabulary that the developers use. In
this case the merge operation is one that has a precise meaning in
database lingo, which apparently you do not have background in. My
experience in tryi
I agree. I have a foot of books on R now, for example the R Book by
Michael Crowly. But so far, Googling the archives of this list has been
the most help. Nonetheless, if I cannot understand the documentation of
a function, then the documentation needs to be updated. For example,
there needs to be
James Rome wrote:
On 2/1/2010 5:51 PM, David Winsemius wrote:
I figured this out finally. I really believe that the R help write-ups
are sorely lacking.
The help docs are probably not the best way to learn R, but they are
great for users of the functions. I have found that after going thro
On 2/1/2010 5:51 PM, David Winsemius wrote:
I figured this out finally. I really believe that the R help write-ups
are sorely lacking. As soon as I looked at
http://www.statmethods.net/management/merging.html, it was obvious:
Adding Columns
To merge two dataframes (datasets) horizontally, us
David,
Now the code is:
for (j in seq_along(rwy)) { # subset the data and merge them
ar4rw = ar4rw <- subset(arrgnd, arrgnd$Runway==rwy[j])
if(j == 1) {
arrw = ar4rw
}
else {
arrw = merge(arrw, ar4rw)
}
}
I attach the data. I needed 500 rows to get both runways in rwy.
The suggestions did not h
On Feb 1, 2010, at 5:16 PM, James Rome wrote:
Dear kind R helpers,
I have a vector of runway names in rwy ("31R", "31L",... the
number is user selectable)
arrgnd is a data frame with data for all flights and all runways,
with a Runway column.
I am trying to subset arrgnd into a dat frame
Dear kind R helpers,
I have a vector of runway names in rwy ("31R", "31L",... the number is
user selectable)
arrgnd is a data frame with data for all flights and all runways, with a
Runway column.
I am trying to subset arrgnd into a dat frame for each selected runway,
and then combine them b
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