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Cuichang Zhao

2005-Jan-25 07:25 UTC

[R] more question

Hello, 
thank you very much for your help in last email. it is very helpful. right now,
i have more questions about my project,
 
1. solve can i remove the NA from a vectors:
for exmample, if my vector is:
v <- (NA, 1, 2, 3, 4, 5)
how can I remove the NA from vector v
 
2. how I can get input from the user?
 
3. can I read more than one data files in one program? and how i can write
something to a file
 
4. how i can display/output something on the screen?
 
thank you so much
 
Best wish
 
C-Ming
 
Jan 24, 2005
 
 

		
---------------------------------


	[[alternative HTML version deleted]]

Uwe Ligges

2005-Jan-25 08:00 UTC

head link

[R] more question

Cuichang Zhao wrote:> Hello, 
> thank you very much for your help in last email. it is very helpful. right
now, i have more questions about my project,
>  
> 1. solve can i remove the NA from a vectors:
> for exmample, if my vector is:
> v <- (NA, 1, 2, 3, 4, 5)
> how can I remove the NA from vector v
>  
> 2. how I can get input from the user?
>  
> 3. can I read more than one data files in one program? and how i can write
something to a file
>  
> 4. how i can display/output something on the screen?
>  
> thank you so much
>  
> Best wish
>  
> C-Ming
>  
> Jan 24, 2005
>  
>  
> 
> 		
> ---------------------------------
> 
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
Please do a suggested above: Read the posting guide and read a minimal 
amount of documentation, as well as the R FAQ and learn to search the 
mailing list archives.

Uwe Ligges

Mulholland, Tom

2005-Jan-25 08:10 UTC

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[R] more question

The answers to your questions are in the text below. However these questions are
generally answered in the base documentation. You might try going through the
Keywords by Topic which on the windows system at least) is accessed by going
through the html help entry on the help menu. Once your browser is open select
"Search Engine & Keywords." Depending on how your browser is set
up you may have to scroll down to the keywords. I found it helpful to browse
through the categories to get a feel for what R can do.


> -----Original Message-----
> From: Cuichang Zhao [mailto:cuiczhao at yahoo.com]
> Sent: Tuesday, 25 January 2005 3:25 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] more question
> 
> 
> Hello, 
> thank you very much for your help in last email. it is very 
> helpful. right now, i have more questions about my project,
>  
> 1. solve can i remove the NA from a vectors:
> for exmample, if my vector is:
> v <- (NA, 1, 2, 3, 4, 5)
> how can I remove the NA from vector v
Assuming you meant v <- c(NA, 1, 2, 3, 4, 5)

then

v[!is.na(v)]

An introduction to R, Page 10 gives an example >  
> 2. how I can get input from the user?
Page 279 of the Full reference Manual
?readline

fun <- function() {
       ANSWER <- readline("Are you a satisfied R user? ")
       if (substr(ANSWER, 1, 1) == "n")
         cat("This is impossible.  YOU LIED!\n")
       else
         cat("I knew it.\n")
     }
fun()
>  
> 3. can I read more than one data files in one program? and 
> how i can write something to a file
Yes, The whole document R Data Import/Export is devoted to this topic. There are
too many ways to answer this question.
>  
> 4. how i can display/output something on the screen?

cat("something")
print("something")
plot(5)
plot(v)

Try searching for device in the Full reference manual, if you are interested in
the various ways output mechanisms.

I think you need to be more precise in your question.>  
> thank you so much
>  
> Best wish
>  
> C-Ming
>  
> Jan 24, 2005
>  
>  
> 
> 		
> ---------------------------------
> 
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! 
> http://www.R-project.org/posting-guide.html
>

Petr Pikal

2005-Jan-25 08:25 UTC

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[R] more question

Hi

On 25 Jan 2005 at 9:00, Uwe Ligges wrote:
> Cuichang Zhao wrote:
> > Hello, 
> > thank you very much for your help in last email. it is very helpful.
> > right now, i have more questions about my project,
> >  
> > 1. solve can i remove the NA from a vectors:
> > for exmample, if my vector is:
> > v <- (NA, 1, 2, 3, 4, 5)
v[!is.na(v)]
> > how can I remove the NA from vector v
> >  
> > 2. how I can get input from the user?
scan()  probably?
> >  
> > 3. can I read more than one data files in one program? and how i can
> > write something to a file
what program?

sink, write, ...
> >  
> > 4. how i can display/output something on the screen?
print,

And most effective, what Uwe did recommend, read available 
documentation (R-intro, help pages).
> >  
> > thank you so much
> >  
> > Best wish
> >  
> > C-Ming
> >  
> > Jan 24, 2005
> >  
> >  
> > 
> > 		
> > ---------------------------------
> > 
> > 
> > 	[[alternative HTML version deleted]]
> > 
> > ______________________________________________
> > R-help at stat.math.ethz.ch mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide!
> > http://www.R-project.org/posting-guide.html
> 
> Please do a suggested above: Read the posting guide and read a minimal
> amount of documentation, as well as the R FAQ and learn to search the
> mailing list archives.
> 
> Uwe Ligges
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
Petr Pikal
petr.pikal at precheza.cz

joerg van den hoff

2005-Jan-25 08:53 UTC

head link

[R] more question

Cuichang Zhao wrote:> Hello, 
> thank you very much for your help in last email. it is very helpful. right
now, i have more questions about my project,
>  
> 1. solve can i remove the NA from a vectors:
> for exmample, if my vector is:
> v <- (NA, 1, 2, 3, 4, 5)
which should read v <- c(NA, 1, 2, 3, 4, 5):


> how can I remove the NA from vector v
>  v <- v[!is.na(v)]
> 2. how I can get input from the user?
try "?readline"
>  
> 3. can I read more than one data files in one program? and how i can write
something to a file
?read.table, ?write.table, ?scan, ?readLines, ?write>  
> 4. how i can display/output something on the screen?
?print, ?x11, ?plot, ?Devices>  
> thank you so much
>  
> Best wish
>  
> C-Ming
>  
> Jan 24, 2005one remark: I personally think it's a bad idea to refer people too 
quickly (with implied reproach) to the manuals (if the manuals are good, 
_anything_ is written down _somewhere_ but it might take substantial 
time to find it).
but at the very least your questions 2.-4. (and the solution to no. 1 is 
not so hard to find either) are so elementary, that you probably have 
not spent a single minute reading the documentation (online help or e.g. 
Introduction to R). and that is in my view not a healthy ratio of "time 
I invested myself to solve the problem" to "time others invest to
solve
my problem".

no offense meant, but really ...

joerg>  
>  
> 
> 		
> ---------------------------------
> 
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
>

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