Displaying 3 results from an estimated 3 matches for "sumdf".
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numdf
2005 Feb 03
1
Efficient selection and alteration of dataframe records
...p=c("Sp1","Sp2","Sp3","Sp4","Sp5"),
width=runif(5),
abun=abun.table$Freq)
traitdf[1,]
rm(abun.table)
#3. merge plotdf and traitdf
plotdft=merge(plotdf, traitdf, by.x ="pspp", by.y="tspp")
#4 define summary dataframe sumdf
sumdf=data.frame(s.n=NA, s.S=NA, s.crop=NA)
#reset all data to raw data.
#b. calculate crop in plotdft with all species present
plotdft$crop=plotdft$width*exp(-2.0+2.42*(log(plotdft$dim)))
#c. sum crop
sumcrop=sum(plotdft$crop)
#d. write n, S, crop to sumdf
sumdflength=...
2007 Oct 17
1
passing arguments to functions within functions
...c
("e","f"))
df$resp1=rnorm(length(df$fac1))
df
# define a funciton to compute mean, std error and n.
meanstderr <- function(x) c(Mean=mean(x,na.rm=TRUE),se=sqrt(var
(x,na.rm=TRUE)/length(na.omit(x))), n=length(na.omit(x)))
# what I want to wrap into a single funtction:
sumdf=with(df, summarize(X=resp1, by=llist(fac1, fac2, fac3),
stat.name="resp1", FUN=meanstderr))
xYplot(Cbind(resp1, resp1-se, resp1+se) ~ as.numeric(fac1)|fac2,
groups=fac3, data=sumdf, type='b',
scales=list(x=list(labels=levels(df$fac1), at=1:length(levels(df
$fac1)))), xlim=c(0...
2011 Apr 15
1
how to add two data.frame with the same column but different row numbers
Hi all,
Suppose I have 2 data.frame , a and b, how can I add them together to get c?
Thanks
> a
A
a 1
b 2
c 3
> b
A
a 6
c 1
> c
A
a 7
b 2
c 4
--
Best,
Zhenjiang
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