On Apr 28, 2010, at 5:45 PM, David Winsemius wrote:
On Apr 28, 2010, at 5:31 PM, Bunny, lautloscrew.com wrote:
Dear all,
i have a problem with processing dataframes within a function using
the "$".
Here´s my code:
recode_items = function(dataframe,number,medium=2){
# this works
q<-paste("columna",number,sep="")
Do your really want q to equal "columna2" when "number" equals 2?
# this does not work, particularly because "dataframe" is not
processed
# dataframe should be: givenframe$columnagivennumber
a=dataframe$q[dataframe$q==medium]=1
Did you want a further logical test with that "=1" or some sort of
assignment???
a) Do you want to work on the column from dataframe ( horrible name
for this purpose IMO) with the name "columna2"? If so, then start with
dataframe[ , q ]
.... the "q" will be evaluated in this form whereas it would not
when used with "$".
b) (A guess in absence of explanation of a goal.) Now do you want
all of the rows where that vector equals "medium"? If so ,then try
this:
dataframe[ dataframe[ , q ]==2 , ] # untested in the absence of data
Ooops. should have been:
dataframe[ dataframe[ , q ]==medium , ] #since both q and medium will
be evaluated.
Moral: Generally better to use "[" indexing.
--
David.
return(a)
}
If I call this function, i´d like it to return my dataframe. The
problem appears to be somewhere around the $. I´m sure this not too
hard, but somehow i am stuck. I´ll keep searchin the manuals.
Thx for any help in advance.
best
matt
[[alternative HTML version deleted]]
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and provide commented, minimal, self-contained, reproducible code.
