R help - May 2011 - remove ", " at the end of each line for all lines except the first line in a data frame

the question ask me to use gsub() and subsetting to remove the comma at the
end of the for all but the first value in a data frame.

the first few lines are like the following:
[1] "2177663,-41,175,2678248,6021224,1840,5,25,17,,,6,,"
 "2177691,-39.6,176.2,2784798,6173592,1843,7,8,5,30,,7.6,12,"       
[3] "2177754,-47,166,1977803,5333806,1846,7,13,6,20,,63,,"
"2177759,-41,172,2425856,6022664,1846,11,18,19,,,65,,"             
[5] "2177762,-41,174.5,2636191,6022065,1846,12,4,5,45,,6,,"
"2177819,-41.9,173.60001,2559794,5923028,1848,10,15,14,10,,7.4,12,"

this data frame is called the originalQuakes

thank you for reading this, and please help!



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Homework question? This one's pretty easy; see

?regex
?gsub

A couple of examples on gsub()'s help page are rather close to what
you need. The basic structure is

gsub(<string to replace>, <replacement string>, name_of_string)

where the strings are enclosed in quotes. If you need to apply this
function to each row of your data frame, see ?apply and put the gsub()
code into an anonymous function.

Best of luck!
Dennis


On Sat, May 28, 2011 at 5:54 AM, xiaerwhite <xiaerwhite at hotmail.com>
wrote:
> the question ask me to use gsub() and subsetting to remove the comma at the
> end of the for all but the first value in a data frame.
>
> the first few lines are like the following:
> [1] "2177663,-41,175,2678248,6021224,1840,5,25,17,,,6,,"
> ?"2177691,-39.6,176.2,2784798,6173592,1843,7,8,5,30,,7.6,12,"
> [3] "2177754,-47,166,1977803,5333806,1846,7,13,6,20,,63,,"
> "2177759,-41,172,2425856,6022664,1846,11,18,19,,,65,,"
> [5] "2177762,-41,174.5,2636191,6022065,1846,12,4,5,45,,6,,"
>
"2177819,-41.9,173.60001,2559794,5923028,1848,10,15,14,10,,7.4,12,"
>
> this data frame is called the originalQuakes
>
> thank you for reading this, and please help!
>
>
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/remove-at-the-end-of-each-line-for-all-lines-except-the-first-line-in-a-data-frame-tp3557391p3557391.html
> Sent from the R help mailing list archive at Nabble.com.
>
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http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

Thank you very much for your help.I was confused about how to find the length
of a file without using the length function.
Thank you so much for your answer ,Dennis 

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