Farrel Buchinsky-3 wrote:
>
> I sifted some more and read about a workaround for the problem. I could
> simply rename the columns so that there were no more spaces
> names(alltime) <-gsub(" ",".", names(alltime))
>
That would certainly be a solution. The method I was trying to demonstrate
is that in addition to using the $ sign syntax, lists and data.frames can
be accessed using strings- much like a hash. In order to do so, you must use
the [[]] or [] methods.
For example, just as you can do the following for a vector:
x <- c(1,3,5)
for( i in 1:length(x) ){
print( x[ i ] )
}
You could do something similar for your data.frame:
for( i in names(alltime) ){
print( alltime[[ i ]] )
}
The important thing to note is that if you tried to use alltime$i in the
above loop, you would get a bunch of NULLS as there is no component named
'i'.
Hope that helps!
-Charlie
-----
Charlie Sharpsteen
Undergraduate
Environmental Resources Engineering
Humboldt State University
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