[R] space in column name

[cls59]

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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