[GRASSLIST:3351] Re: scripting help

[Gordon Keith]

On Wed, 20 Mar 2002 03:10, Kevin Slover wrote:
> I have exported a vector file using v.out.ascii.  What I am trying to
> do is create a 3d vector file as can be used in GRASS5.1.  How would
> one go about parsing the ascii vector file, using the L  5 as the
> splitter. For example, I have this:
> L  5
>  27.041325    -81.988854
>  27.04215     -81.988854
>  27.04215     -81.988029
>  27.041325    -81.988029
>  27.041325    -81.988854
> L  2
>  27.042149    -81.988853
>  27.039242    -81.985962
>
>
> and want to add on the 3rd dimension as height.  Wouldn't be so
> difficult, however...I need to create several heights at each point
> such that it would look like:
>
>
> 27.041325    -81.988854 2
>
> 27.041325    -81.988854 3
> etc etc...
> I am basically wanting to create "barriers" as defined by the vector
> file.  Any thoughts??

It's not at all clear to me what it is you are want.

awk '{ if($1 != "L") {print $1 " " $2 " " 2; print $1 " " $2 " " 3;} }' 

will do something that would satisfy one interpretation of what you are 
asking.

awk '{if($1=="L") {print $0} else {print $0 " " 2; print $0 " " 3;}}'

may also be what you're after, or perhaps even something like:

awk '{if($1=="L") {print "B " $2 * 2} else {print $0 " " 2; print $0 " 
" 3;}}'

Hope there's enough there to point you in a useful direction.

Regards
Gordon