[R] Modify string-regular expression
Hi there everybody,
I would like to be able to modify a string like 'Param_i = Val_i-1' in 'Param_i
= Val_i-2' in a text file
Indeed I have two arrays :
-One for the name of my parameters
-One for the new values for each parameter
I would like to write a loop like this one :
...
SCAN <- scan("File.txt",sep="\n", what="raw",blank.lines.skip=F)
For (i in 1:Nb_param)
{
sub('Param[i] = Value_i-1','Param[i] = Value_i-2', SCAN)
}
...
I Know how to modify a string with sub when it is a fixed string : sub("(K
=)([0-9]*)",paste("\\1", Value[i,2]),SCAN)
But i would like to know if it is possible to use the function paste or
something else in the first argument of the function sub.
For example, the correct syntax of :
' sub("(Param[i])([0-9]*)",paste("\\1", Value[i,2]),SCAN) '
If I'm not clear enough please let me know..
Thank you for your help.
Romain
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Re: [R] Modify string-regular expression
On 30 May 2008, at 11:25, Romain wrote:
...
SCAN <- scan("File.txt",sep="\n", what="raw",blank.lines.skip=F)
For (i in 1:Nb_param)
{
sub('Param[i] = Value_i-1','Param[i] = Value_i-2', SCAN)
}
...
I Know how to modify a string with sub when it is a fixed string :
sub("(K =)([0-9]*)",paste("\\1", Value[i,2]),SCAN)
But i would like to know if it is possible to use the function paste
or something else in the first argument of the function sub.
For example, the correct syntax of :
' sub("(Param[i])([0-9]*)",paste("\\1", Value[i,2]),SCAN) '
Have a look at ?gsub
Cheers,
--Hans
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and provide commented, minimal, self-contained, reproducible code.
