[R] splitting very long character string

[john seers (IFR)]

Hi Arne

If you are reading in from files and they are just one number per line
it would be more efficient to use scan directly.  ?scan

For example:

> filen<-"C:/temp/tt.txt"
> i<-scan(filen)
Read 5 items
> i
[1]   12345  564376    5674 6356656    5666
> 


 


-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of
Arne.Muller at sanofi-aventis.com
Sent: 01 November 2006 15:47
To: r-help at stat.math.ethz.ch
Subject: [R] splitting very long character string


Hello,

I've a very long character array (>500k characters) that need to split
by '\n' resulting in an array of about 60k numbers. The help on strsplit
says to use perl=TRUE to get better formance, but still it takes several
minutes to split this string.

The massive string is the return value of a call to xmlElementsByTagName
from the XML library and looks like this:

...
12345
564376
5674
6356656
5666
...

I've to read about a hundred of these files and was wondering whether
there's a more efficient way to turn this string into an array of
numerics. Any ideas?

	thanks a lot for your help
	and kind regards,

	Arne




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