[R] convert "1", "10", and "100" to "0001", "0010", "0100" etc.

[Nick Matzke]

Thanks!!

David Winsemius wrote:
> 
> On Sep 10, 2010, at 4:05 PM, Nick Matzke wrote:
> 
>> Hi,
>>
>> Is there an easy way to convert numbers into a form such that they all 
>> have the same number of digits?
>>
>> e.g.:
>> "1", "10", and "100"
>>
>> ...become...
>>
>> "0001", "0010", "0100" etc.
> 
>  > sprintf("%05.0f", 100)
> [1] "00100"
> 
>  > sprintf("%04.0f", 100)
> [1] "0100"
> 
> 
>>
>> I ask because I am producing a large number of files that need to sort 
>> consistently by filename.  Currently I get this kind of sorting:
>>
>> filename1
>> filename10
>> filename11
>> filename12
>> filename13
>> filename14
>> filename15
>> filename16
>> filename17
>> filename18
>> filename19
>> filename2
>> filename20
>> filename21
>> ...etc..
>>
>> which is annoying.  Ideally I'd have:
>>
>> filename0001
>> filename0002
>> filename0003
>> filename0004
>> filename0005
>> filename0006
>> filename0007
>> filename0008
>> filename0009
>> filename0010
>> filename0011
>> ...etc..
>>
>> Basically I want to produce strings like "0010" without an elaborate 
>> hack.
>>
>> Thanks!
>> Nick
>>
>>
>>
>>
>> -- 
>> ====================================================
>> Nicholas J. Matzke
>> Ph.D. Candidate, Graduate Student Researcher
>> Huelsenbeck Lab
>> Center for Theoretical Evolutionary Genomics
>> 4151 VLSB (Valley Life Sciences Building)
>> Department of Integrative Biology
>> University of California, Berkeley
>>
>> Graduate Student Instructor, IB200A
>> Principles of Phylogenetics: Systematics
>> http://ib.berkeley.edu/courses/ib200a/index.shtml
>>
>> Lab websites:
>> http://ib.berkeley.edu/people/lab_detail.php?lab=54
>> http://fisher.berkeley.edu/cteg/hlab.html
>> Dept. personal page: 
>> http://ib.berkeley.edu/people/students/person_detail.php?person=370
>> Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
>> Lab phone: 510-643-6299
>> Dept. fax: 510-643-6264
>> Cell phone: 510-301-0179
>> Email: matzke at berkeley.edu
>>
>> Mailing address:
>> Department of Integrative Biology
>> 3060 VLSB #3140
>> Berkeley, CA 94720-3140
>>
>> -----------------------------------------------------
>> "[W]hen people thought the earth was flat, they were wrong. When 
>> people thought the earth was spherical, they were wrong. But if you 
>> think that thinking the earth is spherical is just as wrong as 
>> thinking the earth is flat, then your view is wronger than both of 
>> them put together."
>>
>> Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical 
>> Inquirer, 14(1), 35-44. Fall 1989.
>> http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
>>
>> ______________________________________________
>> R-help at 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.
> 
> David Winsemius, MD
> West Hartford, CT
> 
> 

-- 
====================================================
Nicholas J. Matzke
Ph.D. Candidate, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Graduate Student Instructor, IB200A
Principles of Phylogenetics: Systematics
http://ib.berkeley.edu/courses/ib200a/index.shtml

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: 
http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. 
When people thought the earth was spherical, they were 
wrong. But if you think that thinking the earth is spherical 
is just as wrong as thinking the earth is flat, then your 
view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The 
Skeptical Inquirer, 14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm