R help - Jan 2016 - Read all the 332 files and count the number of complete rows

Hi,

I want this function to read all the 332 files and count the number of
complete rows
in the data. When I run this function, I am getting only the last one.
It should give me id and rowcount for 332 files in one vector.

What am I doing wrong in this code?

 complete<-function(id=1:332){
  all_files<-list.files()
  for (i in id){
  ncases<-nrow(na.omit(read.csv(all_files[i])))
  idcase<-cbind(id,ncases)}
}

Regards,
Sai.

	[[alternative HTML version deleted]]

Hi

Just to clarify.
Both id and and ncases are numbers. You say you want a vector. In that case just
plain

idcase<-c(idcase,ncases)

shall give you desired vector, provided you initialize idcase before cycle by

idcase <- NA

The code itself is suboptimal but if you have only couple of files it does not
matter much.

If you wanted some other result please explain it by dput(expectedresult)

Cheers
Petr

-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Baba s
Sent: Thursday, January 28, 2016 2:42 AM
To: r-help at r-project.org
Subject: [R] Read all the 332 files and count the number of complete rows

Hi,

I want this function to read all the 332 files and count the number of complete
rows in the data. When I run this function, I am getting only the last one.
It should give me id and rowcount for 332 files in one vector.

What am I doing wrong in this code?

 complete<-function(id=1:332){
  all_files<-list.files()
  for (i in id){
  ncases<-nrow(na.omit(read.csv(all_files[i])))
  idcase<-cbind(id,ncases)}
}

Regards,
Sai.

        [[alternative HTML version deleted]]

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The number 332 suggests that this is homework from Peng's online class.
Isn't there there a website  for questions regarding these exercises?

I have observed a fair number of similar question on StackOverflow over the
years so you might also search there, since your error is a fairly common one.
Homework on StackOverflow is not deprecated if the question demonstrates effort
and a good description of the difficulty (both of which I do see.)

After completing your course, you may want to read the Posting Guide, subscribe
to rhelp, but please do use plain text.

-- David.
> On Jan 27, 2016, at 10:41 PM, PIKAL Petr <petr.pikal at precheza.cz>
wrote:
> 
> Hi
> 
> Just to clarify.
> Both id and and ncases are numbers. You say you want a vector. In that case
just plain
> 
> idcase<-c(idcase,ncases)
> 
> shall give you desired vector, provided you initialize idcase before cycle
by
> 
> idcase <- NA
> 
> The code itself is suboptimal but if you have only couple of files it does
not matter much.
> 
> If you wanted some other result please explain it by dput(expectedresult)
> 
> Cheers
> Petr
> 
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Baba s
> Sent: Thursday, January 28, 2016 2:42 AM
> To: r-help at r-project.org
> Subject: [R] Read all the 332 files and count the number of complete rows
> 
> Hi,
> 
> I want this function to read all the 332 files and count the number of
complete rows in the data. When I run this function, I am getting only the last
one.
> It should give me id and rowcount for 332 files in one vector.
> 
> What am I doing wrong in this code?
> 
> complete<-function(id=1:332){
>  all_files<-list.files()
>  for (i in id){
>  ncases<-nrow(na.omit(read.csv(all_files[i])))
>  idcase<-cbind(id,ncases)}
> }
> 
> Regards,
> Sai.
> 
>        [[alternative HTML version deleted]]
> 
> ______________________________________________
> 
David Winsemius
Alameda, CA, USA