Hi ,
Thanks for the timely reply in,z is the larger dataframe and m is the
shorter dataframe.
The code took more than 2 hrs and I had to kill it.
Another way putting this question could be; how can I use th family of
(apply) funtions to get the summary of one of the variables based on two
factors?
Thanks again,
arnoldo wrote:
>
> Hi all,
>
> This is a really basic question but I can't figure it out.
>
> I am trying to write a piece of code that will use two datasets, z and
> m..
> This code is meant to assign the mean of selected values in dataset m to a
> new column z$c in datset z but the rows and columns of the two data sets
> differ.
>
> I managed to write this down but think I am missing something standard but
> basic,I will really appreciate if someone could point out where I' am
> going wrong or help me out with a piece of code for this.Google did not
> help me even and the R manuals gave me hints.
>
> "The shoulders will never grow beyond the head".
>
> for (k in 1:nrow(z))
> + for (g in 1:nrow(m))
> + for (l in 1:3)
> + for (j in 15:43){
> + z$ccs[k]<-mean(m[m$soi[g]==l&m$week[g]==j,]$CCS,na.rm=TRUE)}
>
>
>
>
>
>
>
>
>
>
> [[alternative HTML version deleted]]
>
>
> ______________________________________________
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> PLEASE do read the posting guide
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>
>
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