[R] code that will use two data sets which differ in size.

[arnoldo]

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
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

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