How to extract length of axis to a symbol?

["McCann, Mike" <mccann@xxxxxxxxx>]

Quick question, I hope...

After defining an axis, e.g.:

DEFINE AXIS/T=($TMIN):($TMAX):7200/UNITS=seconds TNEW

How do I get the number of points in the axis and assign
the number to a symbol?


(This is for a go file that I'm writing to combine separate
mooring deployment netCDF files into a single netCDF file
that contains all the data on a single grid.)

Thanks in advance,
Mike

--
Mike McCann   (mccann@mbari.org)
Group Leader, Information Applications Group
Monterey Bay Aquarium Research Institute
7700 Sandholdt Road
Moss Landing, CA 95039-9644
Voice: (831) 775-1769   Fax: (831) 775-1646 http://www.mbari.org/rd/iag.htm


> -----Original Message-----
> From: Steve Hankin [mailto:hankin@pmel.noaa.gov]
> Sent: Thursday, March 15, 2001 6:14 PM
> To: Andrew Wittenberg
> Cc: ferret_users
> Subject: Re: How to extract file name to symbol?
> 
> 
> Hi Andrew,
> 
> There will be a clean solution to this in Ferret V5.3 where 
> you will have
> 
>     `my_var,return=dset`      - to get the data set name
>     `my_var,return=dsetnum`   - to get the data set number
>     `my_var,return=dsetpath`  - to get the full data set name&path
> 
> In V5.22 the following kludge will capture the data set name 
> and title as
> symbols
> 
>      use coads_climatology
>      plot/set sst[i=1,j=1,l=1]
>      !show symbols   ! the whole list of 'em
>      show symbol LAB($LABNUM_DATITL)
>      show symbol LAB($LABNUM_DSET)
> 
> The kludge needed to get the full path is uglier. I think 
> you'd have to do
> something like
> 
>      use coads_climatology
>      list sst[i=1,j=1,l=1]
>      list/clobber/file=out.dat sst[i=1,j=1,l=1]
>      sp head -5 out.dat | tail -1 | sed 's/^.*DATA SET:/DEFINE SYMBOL
>      dpath/' >out.jnl
>      go out.jnl
>      show symbol dpath
> 
> Incidentally, V5.3 also has a way to grab the output of any 
> Unix command as a
> string variable. But that's just frustrating knowledge at 
> this point, isn't
> it!
> 
>     - steve
> 
> ============================================
> 
> Andrew Wittenberg wrote:
> 
> > Does anyone know how to get the complete file name 
> corresponding to a
> > dataset number, and place it in a string symbol?  Ferret 
> will display the
> > info with, e.g.,
> >
> > yes? show data/brief 4
> >      currently SET data sets:
> >     4> /net/atw/dynamic/predict/cz/diags/diag439/climatology.nc
> >
> > but I can't figure out how to get hold of that file name so 
> I can use it
> > in a script.  Is it stored in an internal ppl symbol 
> somewhere?  Or is
> > there any way to send the output of "show data" to a file?
> >
> > Thanks for any help you can give,
> >
> > Andrew
> >
> > 
> ----------------------------------------------------------------------
> > Andrew Wittenberg          Program in Atmospheric and 
> Oceanic Sciences
> > andyw@splash.princeton.edu                Sayre Hall, 
> Forrestal Campus
> >                                                   Princeton 
> University
> >                                               Princeton, NJ 
> 08544-0710
> > 
> ----------------------------------------------------------------------
> 
> --
> 
>                 |  NOAA/PMEL               |  ph. (206) 526-6080
> Steve Hankin    |  7600 Sand Point Way NE  |  FAX (206) 526-6744
>                 |  Seattle, WA 98115-0070  |  hankin@pmel.noaa.gov
> 
>