[R] Invalid Type of Char Argument When Sum() is Used
jim holtman
jholtman at gmail.com
Fri Mar 13 10:31:15 CET 2009
Do an 'str(dat)' and see what the structure is. When I read in your data I get:
> x
V1 V2 V3
1 AAA 1000000.0 1222.312
2 AAC 100.2 0.330
> str(x)
'data.frame': 2 obs. of 3 variables:
$ V1: Factor w/ 2 levels "AAA","AAC": 1 2
$ V2: num 1000000 100
$ V3: num 1222.31 0.33
> sum(x$V1)
Error in Summary.factor(1:2, na.rm = FALSE) :
sum not meaningful for factors
> sum(x$V2)
[1] 1000100
So you 'V1" might be characters which is exactly what your error
message is telling you.
On Fri, Mar 13, 2009 at 4:37 AM, Gundala Viswanath <gundalav at gmail.com> wrote:
> Hi all,
>
> I have the following data
>
> AAA 1e+06 1222.312
> AAC 100.2 0.33
>
> However the following command
>
> dat <- read.table("mydat.txt");
>
> print(dat)
>
> n1 <- sum(as.matrix(dat$V1));
>
> gives:
> Error in sum(as.matrix(dat$V1)) : invalid 'type' (character) of argument
>
>
> What's wrong with the data type so that it gives such error?
>
>
> - Gundala Viswanath
> Jakarta - Indonesia
>
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--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
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