By function
Hello On Fri, Apr 8, 2011 at 12:38 AM, Raoni Rodrigues
<caciquesamurai at gmail.com> wrote:
Hello all! I have a data frame with nine variables and 293 cases. (attached goes the csv file).
The CSV didn't get through so it's difficult to replicate your example. Please post the output of: str(cpue)
I need to calculate a index using the sum of one variable (N) divided by the length of other variable (Fisherman), but for each day (Date). I tried to use that codes: by (cpue, cpue$Date, function (x) sum (cpue$N)/length(cpue$Fisherman))
[..]
In both codes, as result, I received the same value for all Date value. And, oddly, this result is the value of calculation for all data frame, as I used just: sum (cpue$N)/length(cpue$Fishermans) From the code above, this is expected since in the function()
statement you use the entire df (cpue) and not the subset (x). Try this: by (cpue, cpue$Date, function (x) sum (x$N)/length(x$Fisherman))
Sorry for the basic question, but I worked on this simple code all day and can't do it work out! And have no idea why... I'm using R 2.11 in Windows XP.
It is often a good a idea to post the output of sessionInfo() Regards Liviu
Since now, thanks for the attention and all help, Best, Raoni
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