[R] more on vector vs array

[Dimitris Rizopoulos]

you could use something like this:

dat1 <- data.frame(station = rep(letters[1:5], 4), temp = 
round(rnorm(20, 15, 3)))
dat2 <- data.frame(station = letters[1:5], temp = round(rnorm(5, 15, 
4)))
################
dat <- merge(dat1, dat2, by = "station")
do.call("rbind", lapply(split(dat, dat$station), function(x){
        out <- x[x$temp.x > x$temp.y, ]
        if(nrow(out)) out else rep(NA, length(x))
    }))


I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/16/336899
Fax: +32/16/337015
Web: http://www.med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "alessandro carletti" <alxmilton at yahoo.it>
To: "rHELP" <R-help at stat.math.ethz.ch>
Sent: Tuesday, August 09, 2005 9:58 AM
Subject: [R] more on vector vs array


>
> Ok, thanks,
> I'll try with a simplier example:
>
> I have a vector with 4 levels
>
> dataframe 1
> station   temp
> aaa        12
> aaa        13
> bbb        12
> bbb        20
> aaa        23
> bbb        21
> ccc        30
> ccc        18
> ddd        15
> aaa        11
> ddd        15
> ddd        10
>
>
> and a thresholds vector
>
> station    thr
> aaa         20
> bbb         18
> ccc         25
> ddd         10
>
>
> I vant to select from dataframe 1 each value (level by
> level) > its own threshold value.
> How to do it automatically? (vector temp and vector
> thr have different length)
>
> Thanks
>
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