[R] Alter a line in a file.

[Petr PIKAL]

Hi

r-help-bounces at r-project.org napsal dne 05.05.2011 15:13:34:

> Joel <joda2457 at student.uu.se> 
> Odeslal: r-help-bounces at r-project.org
> 
> 05.05.2011 15:13
> 
> 
> jholtman wrote:
> > 
> > a <- readLines(textConnection('setting1="value1"
> > setting2="value2"
> > setting3="value3"
> > setting4="value4"'))
> > closeAllConnections()
> > # change  values
> > ac <- sub('setting4="value4"', 'setting4="value5"', a)
> > writeLines(ac, con='myFile.txt')
> > 
> 
> Problem is that I dont know the value on all the settings that I wanna
> change otherwise that looks like something to continue on.
> 

But in that case how would you like to select the setting?

> 
> 
> Petr Pikal wrote:
> > 
> > What file, what is its structure, is it some R object or separate 
file?
> > What did you try and what went wrong?
> > 
> > Regards
> > Petr 
> > 
> 
> Just a normal textfile nothing fancy
> Ive tried diffrent kind of ways of useing my OS witch is linux by the 
system
> command to do it for me but Im not good enought on regexp to get it to 
work
> properly.

I read the simple text file by read.table

> data
                 V1
1 setting1="value1"
2 setting2="value2"
3 setting3="value3"
4 setting4="value4"

> grep("4", data$V1)
[1] 4

Regards
Petr

> 
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