Hi, I used to use reshape and moved to reshape2 (R 2.15.1). Now I tried some of my older scripts and was surprised that my cast function wasn't working like before. What I did/want to do: 1) Melt a dataframe based on a vector specifying column names as measure.vars. Thats working so far: dfm <- melt(df, measure.vars=n, variable_name = "species", na.rm = FALSE)
2) Recast the dataframe: dfc <- cast(dfm, Var1 + Var2 + Var3 + Var4 ~ species,max) # with reshape dfc <- dcast(dfm, Var1 + Var2 + Var3 + Var4 ~ species,max) # with reshape2 but then I get (this is new to reshape2!) a warning message: In .fun(.value[0], ...) : no non-missing arguments to max; returning -Inf The result seems to be similar (but I haven't checked it yet properly)? A message to ignore? I use melt/cast/melt e.g. for multiple measurements (similar name in one column) to get only one row (one measurement) with e.g. the max value. Of course during the procedure I can also use cast/melt to drop columns that are not relevant for further processing. /Johannes ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
