I have not figured out why you seem so attached to the c(type)
strategy but try:
numbers <-summary(rawdata[ , c(type)] )
On Jun 16, 2009, at 12:06 PM, John Fitzgerald wrote:
Hi everyone,
I experience some problems with adressing of data.frames when I
retrieve
some information for geographical position (ypos, xpos) ot of a MySQL
Database and want to perform some simple statistics. The problem is
adressing the dataframes with a construct like
rawdata[c(type)] vs. rawdata$TEMPMIN
to retrieve the numerical information and not a string (I want to
store the
numerical values in a database for graphical expression)
Code Snippet:
type <- "TEMPMIN"
numbers <-summary(rawdata[c(type)])
numbers2 <- summary(rawdata$TEMPMINIMUM)
Results:
numbers
TEMPMIN
Min. :-7.200
1st Qu.: 2.100
Median : 6.200
Mean : 6.588
3rd Qu.:11.800
Max. :18.100
numbers[[1]]
[1] "Min. :-7.200 " <<< which is a string
Whereas:
numbers2
Min. 1st Qu. Median Mean 3rd Qu. Max.
-7.200 2.100 6.200 6.588 11.800 18.100
numbers2[[1]]
[1] -7.2 <<<< which is a numerical value (and can be easily
be
saved in a db)
I've tried some conversions like (as.matrix, as.list,
as.data.frame...), but
still, using the c() construct will change the results of summary() to
strings. The same happens with median()....
Kind regards,
John Fitzgerald
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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and provide commented, minimal, self-contained, reproducible code.
