I'm assuming that you want to add b if 33 & a<5.25])
This is very simple R coding. I recommend you spend some time learning
the basics. There are very good tutorials at the R website.
Julian
[EMAIL PROTECTED] wrote:
> Hello,
>
> A stupid question:
>
> I have an array with two columns, the f
Or even simpler (when cc is a data frame), instead of
sum(cc[cc[,"a"] <= 5.25 & cc[,"a"] >= 3, "b"])
##
with(cc, sum(b[a <= 5.25 & a >= 3]))
Bert Gunter
Genentech Nonclinical Statistics
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PROTECTED]
Sent: Wednesday, November 07, 2007 9:02 AM
To: [EMAIL PROTECTED]
Cc: r-help@r-project.org
Subject: Re: [R] partially sum variable of a dataframe
There's probably a shorter way but below works
and doesn't require the starting points to be in
the a column.
startindex<-3
endi
There's probably a shorter way but below works
and doesn't require the starting points to be in
the a column.
startindex<-3
endindex<-5.25
start<-tail(which(c$a<=startindex),1)
end<-tail(which(c$a<=endindex),1)
sum(c$b[start:end])
>Hello,
>
>A stupid question:
>
>I have an array with two colum
d <- subset(c, c$a > 3 & c$a < 5.25 )
sum(d[,2])
--- [EMAIL PROTECTED] wrote:
> Hello,
>
> A stupid question:
>
> I have an array with two columns, the first "a"
> acting as my index in 0.25 steps, the second one "b"
> the column of interest. How can i sum up "b" only
> for a specified window i
Hello,
A stupid question:
I have an array with two columns, the first "a" acting as my index in 0.25
steps, the second one "b" the column of interest. How can i sum up "b" only for
a specified window in "a" (as the window command for time series)
a=seq(0,10,0.25)
b=runif(41)
c=data.frame(a,b)
sum(c$b[(c$a > 3) & (c$a < 5.25)])
On 11/7/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> Hello,
>
> A stupid question:
>
> I have an array with two columns, the first "a" acting as my index in 0.25
> steps, the second one "b" the column of interest. How can i sum up "b" only
> for a specifi
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