lapply and dynamically linked functions

My guess is that you probably refer to `mylist' instead of `x' inside
`myfun'.  Please show us the entire code, rather than leave us guessing.

Andy
From: Jason Nielsen

Hi all,

I'm trying to use lapply on a list with the following command:

out<-lapply(mylist,myfun,par1=p,par2=d)               (1)

where

myfun<-function(x,par1,par1) {.....}                  (2)

now this function is in fact a wrapper for some Fortran code I have
written so I think this might be the problem.  When I call 
lapply() as in
(1)  I get the following message:

Error in get(x, envir, mode, inherits) : variable "mylist" 
was not found

but if I say do:

out<-lapply(mylist,sum)

it returns a nice list with the sums of the elements in the list.  So
after all that I guess my question is does this have to do 
with the fact
that my function is a wrapper for my Fortran code (which 
works fine on its
own.. and if I use a loop as opposed to lapply() )?  I 
imagine that lapply
which is a wrapper for the .Internal lapply might have some 
trouble with
my Fortran wrapper?  Is this the case or is it something dumb 
on my end?  
Any input is appreciated.

Cheers,
Jason

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Hi all:

Please be patient with my silly question:

How can I get proportions if I have a contingency table ? 

I tried the table command, but I almost sure I made my usual mistakes.

Thaks

Mauricio
Hi all:

Please be patient with my silly question:

How can I get proportions if I have a contingency table ? 

I tried the table command, but I almost sure I made my usual mistakes.

Thaks

Mauricio
See ?prop.table

HTH,

Marc Schwartz
Or look at CrossTable in package gregmisc (which actually uses prop.table) to get something like proc freq in SAS.

HIH,
Stefano
On Wed, 2004-02-11 at 08:49, Mauricio Cardeal wrote:
Hi all:

Please be patient with my silly question:

How can I get proportions if I have a contingency table ? 

I tried the table command, but I almost sure I made my usual mistakes.

Thaks

Mauricio

See ?prop.table

HTH,

Marc Schwartz

______________________________________________
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
Well I finally figured it out.  After proving to myself that it wasn't the 
Fortran wrapper with a simple example I started to dig into this.  The 
problem is that I was naming one of my parameters X... which is the name 
of the input value in lapply... I'm not sure if this is a bug or just the 
way it works but here is an example:

examplegood<-function(kn,XX)
{
  out<-sum(kn)*sum(XX)
  out
}

examplebad<-function(kn,X)
{
  out<-sum(kn)*sum(X)
  out
}

mylist<-vector("list")

for(i in 1:5) mylist[[i]]<-i

a<-1:10

Now run lapply and you get:
lapply(mylist,examplebad,X=a)
Error in get(x, envir, mode, inherits) : variable "mylist" was not found
lapply(mylist,examplegood,XX=a)
[[1]]
[1] 55

[[2]]
[1] 110

[[3]]
[1] 165

[[4]]
[1] 220

[[5]]
[1] 275

Well there you have it!

Cheers,
Jason

My guess is that you probably refer to `mylist' instead of `x' inside
`myfun'.  Please show us the entire code, rather than leave us guessing.

Andy

From: Jason Nielsen

Hi all,

I'm trying to use lapply on a list with the following command:

out<-lapply(mylist,myfun,par1=p,par2=d)               (1)

where

myfun<-function(x,par1,par1) {.....}                  (2)

now this function is in fact a wrapper for some Fortran code I have
written so I think this might be the problem.  When I call 
lapply() as in
(1)  I get the following message:

Error in get(x, envir, mode, inherits) : variable "mylist" 
was not found

but if I say do:

out<-lapply(mylist,sum)

it returns a nice list with the sums of the elements in the list.  So
after all that I guess my question is does this have to do 
with the fact
that my function is a wrapper for my Fortran code (which 
works fine on its
own.. and if I use a loop as opposed to lapply() )?  I 
imagine that lapply
which is a wrapper for the .Internal lapply might have some 
trouble with
my Fortran wrapper?  Is this the case or is it something dumb 
on my end?  
Any input is appreciated.

Cheers,
Jason

______________________________________________
R-help at stat.math.ethz.ch mailing list
https://www.stat.math.ethz.ch/mailman/listinfo/r-help
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http://www.R-project.org/posting-guide.html

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Hi all:

Please be patient with my silly question:

How can I get proportions if I have a contingency table ? 

I tried the table command, but I almost sure I made my usual
mistakes.

Try the prop.table function

I am also putting together R manual for epidemiologist, some of which
you may find useful. It available at
http://www.ucbcidp.org/courses/epiwithr.pdf

Tomas
Thaks

Mauricio

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=====
Tomas Aragon, MD, DrPH
http://www.medepi.org/aragon
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