Hello list,
I'm new to this list, so please forgive my ignorance. I have searched
R-help for some hints into what might be my problem, but I truly have no
idea where to go from here.
I have an object of approximately 15,000 rows and 2 columns. There are
many duplicates in the first column, all with different corresponding
values in the second column. For example (2 is duplicated):
2 3.2
15 1.2
2 8.4
8 9.2
7 0.4
I used the following code to aggregate these based on the first column
and get the min and max:
min<-aggregate(as.numeric(humanneph[,2]),
list(as.numeric(humanneph[,1])), min)
max<-aggregate(as.numeric(humanneph[,2]),
list(as.numeric(humanneph[,1])), max)
Both worked beautifully!
THEN, I accidentally overwrote the object min. Since I hadn't touched
the object humanneph, I copied the above code from my saved history and
re-ran it. I get the following error:
Error in FUN(X[[1L]], ...) : argument "INDEX" is missing, with no
default
So, I went back and again, copying directly from my saved history,
re-made my object humanneph, and re-ran the above code again. Still the
same problem!!!
So, it seems that after running this code once, suddenly aggregate does
not work!!!
Can anyone help me?
My sessionInfo()
R version 2.5.1 (2007-06-27)
i386-pc-mingw32
attached base packages:
[1] "stats" "graphics" "grDevices" "utils" "datasets"
"methods"
[7] "base"
Thanks!
Wyatt
K. Wyatt McMahon, Ph.D.
Postdoctoral Research Associate
Department of Internal Medicine
Texas Tech University Health Sciences Center
Lubbock, TX
79430
(806)743-4072
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