Re: [R] how to define a function in R
Hi Jason,
I did not have time to actually test this code so there may be typos
and some of it may not work as I thought. I would create a copy of
your data in a test directory and experiment with that until you are
confident you have everything working how you want . As a side note,
since you are new to R, I would highly recommend reading an intro book
(as has been suggested) and using a good text editor (if you are not
already). Jumping straight into searching, reading, subsetting, and
writing 400 some data files is a tough way to learn R.
Good luck with your project,
Joshua
##code/comments
setwd(dir = the directory path with your files here)
getwd() # just to make sure it worked
#An alternative to changing the working directory
#would be to include the full path with the file names
#but to me, that is more cumbersome
#The idea is to get a vector of character strings where each element
#is a different file name
filenames - dir(path = ., pattern = ggg|fff, full.names = FALSE,
ignore.case = TRUE)
#print the results to screen
#you can peruse these to make sure they look about right
filenames
#Here I initialize a list with as many elements as filenames
#This will hold all the data to be read in from the text files
my.data - vector(mode = list, length = length(filenames))
#Name the list
names(my.data) - filenames
#The next step is to read in each of the files
#and assign each object created to the relevant element of the list
#I am using a for loop
#it could also be done with the apply family of functions, I believe
#If you do not set sringsAsFactors to FALSE, I believe the 'names'
#columns of your data will be converted to a factor
#which might be problematic
for(i in filenames) {
my.data[[i]] - read.table(file = i, header = TRUE, sep = ,
row.names = TRUE, stringsAsFactors = FALSE)
}
#Obviously you need to make sure the settings of read.table() are appropriate
#for your text files
my.data.subset - lapply(my.data, function(x) {subset(x, name == aaa
| name == bbb)})
#Assuming that there is at least some data kept for each file
#Something like this should work
#Name the new list with your subset data
names(my.data.subset) - filenames
#Use a loop to write each element of your data to the appropriate file
#Also note that if you did not change the working directory
#this will overwrite your files, so be sure you have them saved elsewhere
#unless you are very certain that nothing has/will go wrong
for(i in filenames) {
write.table(x = my.data.subset[[i]], file = i, sep = , row.names =
TRUE, col.names=TRUE)
}
#Some functions you might read about
?read.table
?write.table
?dir
?regexp # for info about how to select only the relevant filenames using dir()
?subset
?'|' #for info on logical operators
?lapply
On Wed, Jul 7, 2010 at 12:11 PM, jd6688 jdsignat...@gmail.com wrote:
Hi Joshua:
Here are what i am going to accomplish:
I have 400 files named as xxx.txt. the content of the file looks like the
following:
name count
1. aaa 100
2. bbb 2000
3. ccc 300
4. ddd 3000
more that 1000 rows in each files.
these are the areas i need help:
1. how can i only read in the files with the string patterns ggg or fff as
part of the file names?
for instance, I only need the file names with the ggg or fff in it
x_ggg_y_1.txt
_fff__xxx.txt
i don't need to read in the files, such as _aaa_.txt
2.how cam rename the files:
for instance: x_ggg_y_1.txt==changed to ggg1a.txt
3.after the files read in, how can i only keep the rows with the aaa and
bbb, everything elses show be removed from the files, but the files still
remain the same file name?
for instance, in the x_ggg_y_1.txt file, it shouls looks like:
name count
1. aaa 100
2. bbb 2000
3. aaa 300
4. bbb 400
Thanks so lot, I am very new to R, I am looking forward to any helps from
you.
On Tue, Jul 6, 2010 at 9:23 PM, Joshua Wiley-2 [via R]
ml-node+2280373-448579502-312...@n4.nabble.comml-node%2b2280373-448579502-312...@n4.nabble.com
wrote:
Hello,
As others have said, its hard to give specific advice without specific
needs, but that's okay; I made up some examples needs and some (rather
silly) code that might handle it. Depending what you need to do, it
may help you get started. I tried to explicitly name all the
arguments in any functions I used.
When I make gmail use basic text format instead of html, code is sent
poorly, so you can trundle off here to see the example, if you like.
http://gist.github.com/466164
Cheers,
Josh
On Tue, Jul 6, 2010 at 3:48 PM, jd6688 [hidden
email]http://user/SendEmail.jtp?type=nodenode=2280373i=0
wrote:
1. how to write a R script?
2.How to write a SAS like macro/generic process to process multiple files
by
using the same funstion in R?
Thanks in advance
--
View this message in context:
Re: [R] how to define a function in R
Chapter 10 of 'An Introduction to R' has the suggestive title Writing your own functions. Isn't that the *first* place you would look? -Peter Ehlers On 2010-07-06 20:57, jd6688 wrote: Thanks Joshua for the example which has been great help me to start. Wish you the best Jason Ding On Tue, Jul 6, 2010 at 9:23 PM, Joshua Wiley-2 [via R] ml-node+2280373-448579502-312...@n4.nabble.comml-node%2b2280373-448579502-312...@n4.nabble.com wrote: Hello, As others have said, its hard to give specific advice without specific needs, but that's okay; I made up some examples needs and some (rather silly) code that might handle it. Depending what you need to do, it may help you get started. I tried to explicitly name all the arguments in any functions I used. When I make gmail use basic text format instead of html, code is sent poorly, so you can trundle off here to see the example, if you like. http://gist.github.com/466164 Cheers, Josh On Tue, Jul 6, 2010 at 3:48 PM, jd6688[hidden email]http://user/SendEmail.jtp?type=nodenode=2280373i=0 wrote: 1. how to write a R script? 2.How to write a SAS like macro/generic process to process multiple files by using the same funstion in R? Thanks in advance -- View this message in context: http://r.789695.n4.nabble.com/how-to-define-a-function-in-R-tp2280290p2280290.htmlhttp://r.789695.n4.nabble.com/how-to-define-a-function-in-R-tp2280290p2280290.html?by-user=t Sent from the R help mailing list archive at Nabble.com. __ [hidden email]http://user/SendEmail.jtp?type=nodenode=2280373i=1mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.htmlhttp://www.r-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/ __ [hidden email]http://user/SendEmail.jtp?type=nodenode=2280373i=2mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.htmlhttp://www.r-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ 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.
Re: [R] how to define a function in R
Hi Joshua: Here are what i am going to accomplish: I have 400 files named as xxx.txt. the content of the file looks like the following: namecount 1. aaa 100 2. bbb2000 3. ccc300 4. ddd 3000 more that 1000 rows in each files. these are the areas i need help: 1. how can i only read in the files with the string patterns ggg or fff as part of the file names? for instance, I only need the file names with the ggg or fff in it x_ggg_y_1.txt _fff__xxx.txt i don't need to read in the files, such as _aaa_.txt 2.how cam rename the files: for instance: x_ggg_y_1.txt==changed to ggg1a.txt 3.after the files read in, how can i only keep the rows with the aaa and bbb, everything elses show be removed from the files, but the files still remain the same file name? for instance, in the x_ggg_y_1.txt file, it shouls looks like: namecount 1. aaa100 2. bbb2000 3. aaa300 4. bbb400 Thanks so lot, I am very new to R, I am looking forward to any helps from you. On Tue, Jul 6, 2010 at 9:23 PM, Joshua Wiley-2 [via R] ml-node+2280373-448579502-312...@n4.nabble.comml-node%2b2280373-448579502-312...@n4.nabble.com wrote: Hello, As others have said, its hard to give specific advice without specific needs, but that's okay; I made up some examples needs and some (rather silly) code that might handle it. Depending what you need to do, it may help you get started. I tried to explicitly name all the arguments in any functions I used. When I make gmail use basic text format instead of html, code is sent poorly, so you can trundle off here to see the example, if you like. http://gist.github.com/466164 Cheers, Josh On Tue, Jul 6, 2010 at 3:48 PM, jd6688 [hidden email]http://user/SendEmail.jtp?type=nodenode=2280373i=0 wrote: 1. how to write a R script? 2.How to write a SAS like macro/generic process to process multiple files by using the same funstion in R? Thanks in advance -- View this message in context: http://r.789695.n4.nabble.com/how-to-define-a-function-in-R-tp2280290p2280290.htmlhttp://r.789695.n4.nabble.com/how-to-define-a-function-in-R-tp2280290p2280290.html?by-user=t Sent from the R help mailing list archive at Nabble.com. __ [hidden email] http://user/SendEmail.jtp?type=nodenode=2280373i=1mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.htmlhttp://www.r-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/ __ [hidden email] http://user/SendEmail.jtp?type=nodenode=2280373i=2mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.htmlhttp://www.r-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- View message @ http://r.789695.n4.nabble.com/how-to-define-a-function-in-R-tp2280290p2280373.html To unsubscribe from how to define a function in R, click here (link removed) =. -- View this message in context: http://r.789695.n4.nabble.com/how-to-define-a-function-in-R-tp2280290p2281376.html Sent from the R help mailing list archive at Nabble.com. [[alternative HTML version deleted]] __ 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.
Re: [R] how to define a function in R
Here are what i am going to accomplish: I have 400 files named as xxx.txt. the content of the file looks like the following: namecount 1. aaa 100 2. bbb2000 3. ccc300 4. ddd 3000 more that 1000 rows in each files. these are the areas i need help: 1. how can i only read in the files with the string patterns ggg or fff as part of the file names? for instance, I only need the file names with the ggg or fff in it x_ggg_y_1.txt _fff__xxx.txt i don't need to read in the files, such as _aaa_.txt 2.how cam rename the files: for instance: x_ggg_y_1.txt==changed to ggg1a.txt 3.after the files read in, how can i only keep the rows with the aaa and bbb, everything elses show be removed from the files, but the files still remain the same file name? for instance, in the x_ggg_y_1.txt file, it shouls looks like: namecount 1. aaa100 2. bbb2000 3. aaa300 4. bbb400 Thanks so lot, I am very new to R, I am looking forward to any helps from you. On Tue, Jul 6, 2010 at 7:19 PM, Nordlund, Dan (DSHS/RDA) [via R] ml-node+2280308-38709657-312...@n4.nabble.comml-node%2b2280308-38709657-312...@n4.nabble.com wrote: -Original Message- From: [hidden email]http://user/SendEmail.jtp?type=nodenode=2280308i=0[mailto: r-help-boun...@r- project.org] On Behalf Of jd6688 Sent: Tuesday, July 06, 2010 3:49 PM To: [hidden email]http://user/SendEmail.jtp?type=nodenode=2280308i=1 Subject: [R] how to define a function in R 1. how to write a R script? 2.How to write a SAS like macro/generic process to process multiple files by using the same funstion in R? Thanks in advance Don't thank me too soon. :-) Your question is equivalent to me going to SAS-L and asking someone to teach me SAS macro language. You need to provide more information about what your task actually is. Where are these file names that you want to process coming from? What do you want to do with them? The basic approach would be to put the file names in a list and then pass the list items one at a time to your function. But how to do that really depends on what you are trying to do. You might also read the posting guide listed at the bottom of every posting. Dan Daniel J. Nordlund Washington State Department of Social and Health Services Planning, Performance, and Accountability Research and Data Analysis Division Olympia, WA 98504-5204 __ [hidden email] http://user/SendEmail.jtp?type=nodenode=2280308i=2mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.htmlhttp://www.r-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- View message @ http://r.789695.n4.nabble.com/how-to-define-a-function-in-R-tp2280290p2280308.html To unsubscribe from how to define a function in R, click here (link removed) =. -- View this message in context: http://r.789695.n4.nabble.com/how-to-define-a-function-in-R-tp2280290p2281383.html Sent from the R help mailing list archive at Nabble.com. [[alternative HTML version deleted]] __ 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.
Re: [R] how to define a function in R
Hi, I recommend that you look at the following help pages and experiment a little (maybe create a toy directory with only three or four files with a few lines each): ?files ?dir ?grep ?strsplit Good luck! Stephan jd6688 schrieb: Here are what i am going to accomplish: I have 400 files named as xxx.txt. the content of the file looks like the following: namecount 1. aaa 100 2. bbb2000 3. ccc300 4. ddd 3000 more that 1000 rows in each files. these are the areas i need help: 1. how can i only read in the files with the string patterns ggg or fff as part of the file names? for instance, I only need the file names with the ggg or fff in it x_ggg_y_1.txt _fff__xxx.txt i don't need to read in the files, such as _aaa_.txt 2.how cam rename the files: for instance: x_ggg_y_1.txt==changed to ggg1a.txt 3.after the files read in, how can i only keep the rows with the aaa and bbb, everything elses show be removed from the files, but the files still remain the same file name? for instance, in the x_ggg_y_1.txt file, it shouls looks like: namecount 1. aaa100 2. bbb2000 3. aaa300 4. bbb400 Thanks so lot, I am very new to R, I am looking forward to any helps from you. On Tue, Jul 6, 2010 at 7:19 PM, Nordlund, Dan (DSHS/RDA) [via R] ml-node+2280308-38709657-312...@n4.nabble.comml-node%2b2280308-38709657-312...@n4.nabble.com wrote: -Original Message- From: [hidden email]http://user/SendEmail.jtp?type=nodenode=2280308i=0[mailto: r-help-boun...@r- project.org] On Behalf Of jd6688 Sent: Tuesday, July 06, 2010 3:49 PM To: [hidden email]http://user/SendEmail.jtp?type=nodenode=2280308i=1 Subject: [R] how to define a function in R 1. how to write a R script? 2.How to write a SAS like macro/generic process to process multiple files by using the same funstion in R? Thanks in advance Don't thank me too soon. :-) Your question is equivalent to me going to SAS-L and asking someone to teach me SAS macro language. You need to provide more information about what your task actually is. Where are these file names that you want to process coming from? What do you want to do with them? The basic approach would be to put the file names in a list and then pass the list items one at a time to your function. But how to do that really depends on what you are trying to do. You might also read the posting guide listed at the bottom of every posting. Dan Daniel J. Nordlund Washington State Department of Social and Health Services Planning, Performance, and Accountability Research and Data Analysis Division Olympia, WA 98504-5204 __ [hidden email] http://user/SendEmail.jtp?type=nodenode=2280308i=2mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.htmlhttp://www.r-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- View message @ http://r.789695.n4.nabble.com/how-to-define-a-function-in-R-tp2280290p2280308.html To unsubscribe from how to define a function in R, click here (link removed) =. __ 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.
Re: [R] how to define a function in R
I don't know this for sure, but I would probably read an introduction to R...
#copy and paste into R
your_fun - function(argument){argument+1}
your_fun(6)
On Tue, Jul 6, 2010 at 5:48 PM, jd6688 jdsignat...@gmail.com wrote:
1. how to write a R script?
2.How to write a SAS like macro/generic process to process multiple files by
using the same funstion in R?
Thanks in advance
--
View this message in context:
http://r.789695.n4.nabble.com/how-to-define-a-function-in-R-tp2280290p2280290.html
Sent from the R help mailing list archive at Nabble.com.
__
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.
--
Stephen Sefick
| Auburn University |
| Department of Biological Sciences |
| 331 Funchess Hall |
| Auburn, Alabama |
| 36849|
|___|
| sas0...@auburn.edu |
| http://www.auburn.edu/~sas0025 |
|___|
Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods. We are mammals, and have not exhausted the
annoying little problems of being mammals.
-K. Mullis
__
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] how to define a function in R
-Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- project.org] On Behalf Of jd6688 Sent: Tuesday, July 06, 2010 3:49 PM To: r-help@r-project.org Subject: [R] how to define a function in R 1. how to write a R script? 2.How to write a SAS like macro/generic process to process multiple files by using the same funstion in R? Thanks in advance Don't thank me too soon. :-) Your question is equivalent to me going to SAS-L and asking someone to teach me SAS macro language. You need to provide more information about what your task actually is. Where are these file names that you want to process coming from? What do you want to do with them? The basic approach would be to put the file names in a list and then pass the list items one at a time to your function. But how to do that really depends on what you are trying to do. You might also read the posting guide listed at the bottom of every posting. Dan Daniel J. Nordlund Washington State Department of Social and Health Services Planning, Performance, and Accountability Research and Data Analysis Division Olympia, WA 98504-5204 __ 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.
Re: [R] how to define a function in R
Hello, As others have said, its hard to give specific advice without specific needs, but that's okay; I made up some examples needs and some (rather silly) code that might handle it. Depending what you need to do, it may help you get started. I tried to explicitly name all the arguments in any functions I used. When I make gmail use basic text format instead of html, code is sent poorly, so you can trundle off here to see the example, if you like. http://gist.github.com/466164 Cheers, Josh On Tue, Jul 6, 2010 at 3:48 PM, jd6688 jdsignat...@gmail.com wrote: 1. how to write a R script? 2.How to write a SAS like macro/generic process to process multiple files by using the same funstion in R? Thanks in advance -- View this message in context: http://r.789695.n4.nabble.com/how-to-define-a-function-in-R-tp2280290p2280290.html Sent from the R help mailing list archive at Nabble.com. __ 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. -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/ __ 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.
Re: [R] how to define a function in R
Thanks Joshua for the example which has been great help me to start. Wish you the best Jason Ding On Tue, Jul 6, 2010 at 9:23 PM, Joshua Wiley-2 [via R] ml-node+2280373-448579502-312...@n4.nabble.comml-node%2b2280373-448579502-312...@n4.nabble.com wrote: Hello, As others have said, its hard to give specific advice without specific needs, but that's okay; I made up some examples needs and some (rather silly) code that might handle it. Depending what you need to do, it may help you get started. I tried to explicitly name all the arguments in any functions I used. When I make gmail use basic text format instead of html, code is sent poorly, so you can trundle off here to see the example, if you like. http://gist.github.com/466164 Cheers, Josh On Tue, Jul 6, 2010 at 3:48 PM, jd6688 [hidden email]http://user/SendEmail.jtp?type=nodenode=2280373i=0 wrote: 1. how to write a R script? 2.How to write a SAS like macro/generic process to process multiple files by using the same funstion in R? Thanks in advance -- View this message in context: http://r.789695.n4.nabble.com/how-to-define-a-function-in-R-tp2280290p2280290.htmlhttp://r.789695.n4.nabble.com/how-to-define-a-function-in-R-tp2280290p2280290.html?by-user=t Sent from the R help mailing list archive at Nabble.com. __ [hidden email] http://user/SendEmail.jtp?type=nodenode=2280373i=1mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.htmlhttp://www.r-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/ __ [hidden email] http://user/SendEmail.jtp?type=nodenode=2280373i=2mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.htmlhttp://www.r-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- View message @ http://r.789695.n4.nabble.com/how-to-define-a-function-in-R-tp2280290p2280373.html To unsubscribe from how to define a function in R, click here (link removed) =. -- View this message in context: http://r.789695.n4.nabble.com/how-to-define-a-function-in-R-tp2280290p2280425.html Sent from the R help mailing list archive at Nabble.com. [[alternative HTML version deleted]] __ 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.
