R help - Aug 2004 - list of frames without first element

R-help,

I have a list of several data frames.

I want to compute the "rowSums" of the columns of these data frames
but  first one.

Something like this 

                    lapply(my.list,rowSums)

Thank you


Luis Ridao Cruz
Fiskiranns??knarstovan
N??at??n 1
P.O. Box 3051
FR-110 T??rshavn
Faroe Islands
Phone:             +298 353900
Phone(direct): +298 353912
Mobile:             +298 580800
Fax:                 +298 353901
E-mail:              luisr at frs.fo
Web:                www.frs.fo

> From: Luis Rideau Cruz
> 
> R-help,
> 
> I have a list of several data frames.
> 
> I want to compute the "rowSums" of the columns of these data 
> frames but  first one.
> 
> Something like this 
> 
>                     lapply(my.list,rowSums)
You're almost there:

 lapply(my.list, function(x) rowSums(x[-1]))

Andy

 
> Thank you
> 
> 
> Luis Ridao Cruz
> Fiskiranns??knarstovan
> N??at??n 1
> P.O. Box 3051
> FR-110 T??rshavn
> Faroe Islands
> Phone:             +298 353900
> Phone(direct): +298 353912
> Mobile:             +298 580800
> Fax:                 +298 353901
> E-mail:              luisr at frs.fo
> Web:                www.frs.fo
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! 
> http://www.R-project.org/posting-guide.html
> 
>

Luis Rideau Cruz wrote:
> R-help,
> 
> I have a list of several data frames.
> 
> I want to compute the "rowSums" of the columns of these data
frames but  first one.
... "but first data.frame" or "but first column"?

"but first data.frame":
  lapply(my.list[-1], rowSums)

"but first column":
  lapply(my.list, function(x) rowSums(x[,-1]))

Uwe Ligges

> 
> Something like this 
> 
>                     lapply(my.list,rowSums)
> 
> Thank you
> 
> 
> Luis Ridao Cruz
> Fiskiranns??knarstovan
> N??at??n 1
> P.O. Box 3051
> FR-110 T??rshavn
> Faroe Islands
> Phone:             +298 353900
> Phone(direct): +298 353912
> Mobile:             +298 580800
> Fax:                 +298 353901
> E-mail:              luisr at frs.fo
> Web:                www.frs.fo
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html