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...mes = 2:8, class = "data.frame") Why site "S1" do not disappeared from data_frame2's structure? And what I have to do to eliminate it definitively from my new data frame (data_frame2)? Sorry for this basic question, but I really did not understand... Thanks in advanced, Raoni -- Raoni Rosa Rodrigues Research Associate of Fish Transposition Center CTPeixes Universidade Federal de Minas Gerais - UFMG Brasil rodrigues.raoni at gmail.com

...;Specie' , summarise, TF = sum (Frequency)) TVolume = ddply (dieta, c('Specie') , summarise, Volume = sum (Volume)) but once they have different length, I could not use together to create a percentage needed in my formula. Any suggestions? Thanks in advanced for help and attention, Raoni dput (diet) structure(list(Specie = structure(c(2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L, 1L, 1L, 1L, 1L), .Label = c("Astyanax", "Schizodon"), class = "factor"), Fooditem = structure(c(6L, 3L, 6L, 1L, 3L, 3L, 3L, 4L, 6L, 2L, 6L, 5L), .Label = c("alga", &quot...

...'serialNumber' of package 'cxxPack' transform a as.data class object in this format, but without time fraction. But I can't find nothing to do the inverse way, transform serial date format in a POSIX class, for exemple. Since now, thanks for your time and atention. All best, Raoni Associate Researcher Fish Passage Center UFMG, Brazil. "Fica proibido o uso da palavra liberdade, a qual será suprimida dos dicionários e do pântano enganoso das bocas. A partir deste instante a liberdade será algo vivo e transparente como um fogo ou um rio, e a sua morada será sempre...

...t (teste$TimeCC, format = "%F %H:%M:%OS4") teste$TimeCC = as.POSIXct (teste$TimeCC) I lost the fraction of seconds. If I use: teste$TimeCC = as.POSIXct(strptime (teste$TimeCC, format = "%F %H:%M:%OS4")) I lost all information and get just <NA>. Thanks in advanced, -- Raoni Rosa Rodrigues Research Associate of Fish Transposition Center CTPeixes Universidade Federal de Minas Gerais - UFMG Brasil rodrigues.raoni@gmail.com dput of input data structure(list(Date = c("06/19/13", "06/19/13", "06/19/13", "06/19/13", "06/19/13&qu...

...ion for all data frame, as I used just: sum (cpue$N)/length(cpue$Fishermans) 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. Since now, thanks for the attention and all help, Best, Raoni

...3 14h 1.431360 10 Conceição Junho 1 3 15h 1.477120 11 Conceição Junho 1 3 16h 1.518510 12 Conceição Junho 1 3 17h 1.041390 13 Conceição Junho 2 3 6h 2.465383 Some one could give me some ideas? I don't even know how to start... Thanks in advanced, -- Raoni Rosa Rodrigues Research Associate of Fish Transposition Center CTPeixes Universidade Federal de Minas Gerais - UFMG Brasil rodrigues.raoni@gmail.com wrong data frame: structure(list(Local = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L), .Label = "Conceição", class = "factor&q...

...4444", "0.532222222", "0.141111111")), .Names = c("Specie", "Food.item", "MWi"), class = "data.frame", row.names = c(NA, -9L)) * * sessionInfo() R version 2.15.2 (2012-10-26) Platform: i386-w64-mingw32/i386 (32-bit) Windows XP * * -- Raoni Rosa Rodrigues Research Associate of Fish Transposition Center CTPeixes Universidade Federal de Minas Gerais - UFMG Brasil rodrigues.raoni@gmail.com [[alternative HTML version deleted]]