HI,
I tried with an example. It looks like I am also getting the same error. I am
using R 2.15.
dfm<-data.frame(Var1=rnorm(10,25),Var2=rnorm(10,15),Var3=rnorm(10,3),Var4=runif(10,0.4),Species=sample(LETTERS[1:4],10,
replace=T))
dfmmelt<-melt(dfm,id="Species",na.rm=FALSE)
dcast(dfmmelt,variable~Species,max)
variable A B C D
#1 Var1 25.8125354 24.1405082 26.9989409 24.7531392
#2 Var2 15.5994468 13.8675085 16.5900085 16.4408974
#3 Var3 3.4704755 4.6132785 5.4582037 1.7146692
#4 Var4 0.8861144 0.9551669 0.9641575 0.4398574
Warning message:
In .fun(.value[0], ...) : no non-missing arguments to max; returning -Inf
Then, I did traceback()
options(warn=2)
> dcast(dfmmelt,variable~Species,value.var="value",max)
Error in .fun(.value[0], ...) :
(converted from warning) no non-missing arguments to max; returning -Inf
> traceback()
7: doWithOneRestart(return(expr), restart)
6: withOneRestart(expr, restarts[[1L]])
5: withRestarts({
.Internal(.signalCondition(simpleWarning(msg, call), msg,
call))
.Internal(.dfltWarn(msg, call))
}, muffleWarning = function() NULL)
4: .signalSimpleWarning("no non-missing arguments to max; returning -Inf",
quote(.fun(.value[0], ...)))
3: vaggregate(.value = value, .group = overall, .fun = fun.aggregate,
..., .default = fill, .n = n)
2: cast(data, formula, fun.aggregate, ..., subset = subset, fill = fill,
drop = drop, value.var = value.var)
1: dcast(dfmmelt, variable ~ Species, value.var = "value", max)
The output seems to be correct.
A.K.
----- Original Message -----
From: Johannes Radinger <jradin...@gmx.at>
To: r-help@r-project.org
Cc:
Sent: Wednesday, July 25, 2012 6:14 AM
Subject: [R] reshape -> reshape 2: function cast changed?
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
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