[R] character to numeric conversion

[Roger Bivand]

On Mon, 19 Mar 2007, Robin Hankin wrote:

> Hello everybody
> 
> thanks for the tips.
> 
> I *think* this should be the same thread....
> 
> 
> The manpage for system() says that lines of over 8095
> characters will be split.  This is causing me problems.
> How do I get round the 8095 character limit?
> 

Can you use sed or awk in a pipe externally to change ", " into "\n" while
still out in the system() call, for example the record separator RS in
awk?

> 
> Simple toy example follows:
> 
> 
> 
> jj <- system("echo 4 | awk '{for(i=1;i<100;i++){printf(\"%s,\", 
> $1)}}'| sed -e \"s/,$//\"",intern=T)
> 
> 
> This is  fine.  But .. . .
> 
> 
> jj <- system("echo 4 | awk '{for(i=1;i<10000;i++){printf(\"%s,\", 
> $1)}}'| sed -e \"s/,$//\"",intern=T)
> 
> 
> 
> has  "jj"  split into three bits, which is upsetting my call.  In my  
> application
> the split occurs in the middle of a multi-digit number, which messes up
> my conversion to numeric?
> 
> 
> 
> 
> 
> 
> 
> --
> Robin Hankin
> Uncertainty Analyst
> National Oceanography Centre, Southampton
> European Way, Southampton SO14 3ZH, UK
>   tel  023-8059-7743
> 
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> 

-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no