R help - Apr 2010 - Passing values to a function when using apply

Hi All

Slightly lost on how should I pass values to a function I am calling
using apply.


apply( veh_drg_animal1[ , c("readCount","gene_length")] ,1, 
stats() )

here stats is a custom function where I want to pass two parameters
from data frame as shown and a third argument which is constant per
instance of apply.


stats <- function ( arg1,agr2,agr3) {
## computation using three parameters
}

This is not a reproducible example. You might simply want:

apply(veh_drg_animal1[, c("readCount", "gene_length")], 1,
stats, arg2,
arg3)

But your "two parameters" from the data.frame are really going to be 
passed as one vector, and then within the stats function you can access 
them individually.  I'm guessing you really want a 2-parameter stats 
function call, but it's hard to tell without a real example.

Abhishek Pratap wrote:
> Hi All
> 
> Slightly lost on how should I pass values to a function I am calling
> using apply.
> 
> 
> apply( veh_drg_animal1[ , c("readCount","gene_length")]
,1,  stats() )
> 
> here stats is a custom function where I want to pass two parameters
> from data frame as shown and a third argument which is constant per
> instance of apply.
> 
> 
> stats <- function ( arg1,agr2,agr3) {
> ## computation using three parameters
> }
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

Try this:

apply( veh_drg_animal1[ , c("readCount","gene_length")] ,1, 
stats, agr3 your_constant)


On Tue, Apr 27, 2010 at 3:10 PM, Abhishek Pratap
<abhishek.vit@gmail.com>wrote:
> Hi All
>
> Slightly lost on how should I pass values to a function I am calling
> using apply.
>
>
> apply( veh_drg_animal1[ , c("readCount","gene_length")]
,1,  stats() )
>
> here stats is a custom function where I want to pass two parameters
> from data frame as shown and a third argument which is constant per
> instance of apply.
>
>
> stats <- function ( arg1,agr2,agr3) {
> ## computation using three parameters
> }
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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