PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Euan Reavie wrote:
I would like to revisit a problem that was discussed previously (see
quoted discussion below). I am trying to do the same thing, using a
string to indicate a column with the same name. I am making "foo" a
string taken from a list of names. It matches the row where "item" =
5, and picks the corresponding "taxon"
foo <- list$taxon[match(5,list$item)]
Let's say this returns foo as "Aulacoseira_islandica". I have another
matrix "counts" with column headers corresponding to the taxon list.
But, when I try to access the data in the Aulacoseira_islandica
column, it instead uses the data from another column. For instance...
columndata <- counts[[foo]]
...returns the data from the wrong column. What it seems to be doing
is converting the text "Aulacoseira_islandica" to a number (25, for
some reason) and reading the count data from column number 25, instead
of from the column labelled with Aulacoseira_islandica.
If I try...
columndata <- counts$Aulacoseira_islandica
...it works fine. Any thoughts?
-Euan
NRRI-University of Minnesota Duluth
______________________
Jason Horn-2
Oct 20, 2006; 06:28pm
[R] Using a string as a variable name
Is it possible to use a string as a variable name? For example:
foo<="var1"
frame$foo # frame is a data frame with with a column titled "var1"
This does not work, unfortunately. Am I just missing the correct
syntax to make this work?
- Jason
______________________________________________
Oct 20, 2006; 06:30pm
Re: [R] Using a string as a variable name
frame[[foo]]
On 10/20/06, Jason Horn <[hidden email]> wrote:
Is it possible to use a string as a variable name? For example:
foo<="var1"
frame$foo # frame is a data frame with with a column titled "var1"
This does not work, unfortunately. Am I just missing the correct
syntax to make this work?
- Jason
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