Hi
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On 25 Aug 2005 at 20:28, A Mani wrote:
Hello,
Is it safe to use tapply when the result will be of dim 2
x 1 or more ? In my PC R crashes.
or gave you an error message?
I tried this
df-data.frame(A=as.factor(sample(1:1,10,
replace=T)),B=as.factor(sample(10:11,10,
replace=T)), num=rnorm(10))
ttt-tapply(df$num, list(df$A,df$B), diff)
and got
Error: cannot allocate vector of size 390664 Kb
In addition: Warning messages:
1: Reached total allocation of 1000Mb: see help(memory.size)
2: Reached total allocation of 1000Mb: see help(memory.size)
and the result with smaller data sets are
df1-data.frame(A=as.factor(sample(1:2,10,
replace=T)),B=as.factor(sample(10:11,10, replace=T)),
num=rnorm(10))
ttt1-tapply(df1$num, list(df1$A,df1$B), diff)
ttt1
1011
1 Numeric,24933 Numeric,25141
2 Numeric,24992 Numeric,24930
df-data.frame(A=as.factor(sample(1:1000,10,
replace=T)),B=as.factor(sample(1:11000,10,
replace=T)), num=rnorm(10))
ttt-tapply(df$num, list(df$A,df$B), diff)
ttt[1:2,1:5]
1 10001 10002 10003 10004
1 NULL NULL NULL Numeric,0 NULL
2 NULL NULL NULL Numeric,0 NULL
so you are probably receiving humonguous table of NULLs, zeros
and few nonzero entries.
You probably need to use different approach
Cheers
Petr
The code used was on a 3-col
data frame with two factor cols and a numeric column. The fn
was diff
. data form being A, B, Num tapply(data$A, list(data$A,
data$B),
diff)
--
A. Mani
Member, Cal. Math. Soc
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Petr Pikal
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