Hello,
Try the following.
agg1 <- aggregate(cbind(Pico, Nano, Micro) ~ Seamount, data = SChla, mean)
agg2 <- aggregate(cbind(Pico, Nano, Micro) ~ Seamount, data = SChla, sd)
names(agg1)[-1] <- paste("u", names(agg1)[-1], sep = ".")
names(agg2)[-1] <- paste("sd", names(agg2)[-1], sep = ".")
merge(agg1, agg2)
Hope this helps,
Rui Barradas
Em 07-09-2012 21:49, Tinus Sonnekus escreveu:
Hi All,
I have a data set wit three size classes (pico, nano and micro) and 12
different sites (Seamounts). I want to produce a table with the mean and
standard deviation values for each site.
Seamount Pico Nano Micro Total_Ch
1 Off_Mount 1 0.0691 0.24200 0.00100 0.31210
2 Off_Mount 1 0.0938 0.00521 0.02060 0.11961
3 Off_Mount 1 0.1130 0.20000 0.06620 0.37920
4 Off_Mount 1 0.0864 0.15900 0.22300 0.46840
5 Off_Mount 1 0.0262 0.04570 0.00261 0.07451
6 Off_Mount 2 0.0314 0.17400 0.12800 0.33340
I tried the following script but get an error message
*Error in results[i, "u.Pico", "u.Nano", "u.Micro"] <- sapply(z, mean) : *
* incorrect number of subscripts *
The code I used:
*SChla <- read.csv("SM_Chla_data.csv")*
*sm <- as.character(unique(SChla$Seamount))*
*
*
*results <-
matrix(NA,nrow=length(sm),ncol=6,dimnames=list(sm,c("u.Pico","u.Nano","u.Micro","sd.Pico","sd.Nano","sd.Micro")))
*
*
*
*for (i in sm){*
*z <- subset(SChla, Seamount==i, select=c(Pico, Nano, Micro))*
*results[i,"u.Pico","u.Nano","u.Micro"] <- sapply(z, mean)*
*results[i,"sd.Pico","sd.Nano","sd.Micro"] <- sapply(z, sd)*
*}*
*
*
*print(results)*
Please can some one advise me how to fix the error or maybe have an
alternative solution I will appreciate it.
Thank you.
Tinus
[[alternative HTML version deleted]]
______________________________________________
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.
______________________________________________
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.
