Re: counting number of elements in a string array??

[Jaison Kurian <jaison@xxxxxxxxxxxxxxxxxx>]

Hi Emilie, James & Ansley,
                             There is an easy fix for the problem paused
using any one of the functions XSEQUENCE, YSEQUENCE, ZSEQUENCE or 
TSEQUENCE. Once the variable is sampled using this function, it will have
the "exact" size along the abstract axis corresponding to the function
used. 

   As a comment : If we know that there are files in the directory with 
                        the given pattern (atleast one) then there is no 
                        need to give the "dummy" along with the spawn
                        (see the example below). 


       NOAA/PMEL TMAP
        FERRET v5.50
        Linux 2.4.3-12smp - 01/15/03
        14-Sep-04 22:46

yes? let fnames = {spawn: "ls *.nc"}
yes? list fnames
             VARIABLE : {SPAWN: "ls *.nc"}
             SUBSET   : 3 points (X)
 1   / 1:"gpcc.nc"
 2   / 2:"junk1.nc"
 3   / 3:"junk.nc"
yes? list `fnames,r=iend`
 !-> list 2000
             VARIABLE : constant
          2000.
yes? list `fnames,r=istart`
 !-> list 1
             VARIABLE : constant
          1.000
yes? let files = XSEQUENCE(fnames)
yes? list `files,r=iend`
 !-> list 3
             VARIABLE : constant
          3.000
yes? let files = YSEQUENCE(fnames)
yes? list `files,r=jend`
 !-> list 3
             VARIABLE : constant
          3.000
yes? let files = TSEQUENCE(fnames)
yes? list `files,r=lend`
 !-> list 3
             VARIABLE : constant
          3.000
yes?


Hope this helps

Jaison 


On Tue, 14 Sep 2004, Ansley Manke wrote:

> Hi Emile and James,
> Yes, this is a known bug with the spawn command.  Thank you for the
> workaround, James.
> 
> Ansley Manke
> 
> James Orr wrote:
> 
> >Emilie,
> >
> >You followed what was in the manual, and you are right: it does NOT 
> >work.  On the other hand it would work if you only listed the files
> >without using the spawn command, e.g.,
> >
> >  let my_files = {"dummy", "box.dat", "boxmar.dat", "dummy"}
> >
> >A work around (while using the spawn command) would be to  do the 
> >following
> >
> >  let my_files = {"dummy", spawn: "ls box*.dat", "dummy"}
> >  let len_files = strlen(my_files)
> >  let one_files = if len_files gt 0 then 1
> >  let n = one_files[i=@sum]
> >  list n
> >
> >-- Jim
> >
> >On Tue, 14 Sep 2004, Emilie Vanvyve wrote:
> >
> >  
> >
> >>Hello,
> >>
> >>I have a little problem when I do the following to count the number of 
> >>elements I have in a string array:
> >>
> >>yes? spawn ls
> >>box.dat                 plot-xy-hlat.jnl        plot-xy-ro.jnl          
> >>plot-xy.set-mask.jnl
> >>boxmar.dat              plot-xy-precp.jnl       plot-xy-t2m.jnl         
> >>plot-xy.set-shakey.jnl
> >>yes?
> >>yes? let my_files = {"dummy", spawn: "ls box*.dat", "dummy"}
> >>yes? list my_files
> >>              VARIABLE : {"dummy", SPAWN: "ls box*.dat", "dummy"}
> >>              SUBSET   : 4 points (X)
> >>  1   / 1:"dummy"
> >>  2   / 2:"box.dat"
> >>  3   / 3:"boxmar.dat"
> >>  4   / 4:"dummy"
> >>yes?
> >>yes? let n = `my_files,return=iend`
> >>  !-> DEFINE VARIABLE n = 2002
> >>yes? let n = `my_files,return=jend`
> >>  !-> DEFINE VARIABLE n = 0
> >>yes? let n = `my_files,return=kend`
> >>  !-> DEFINE VARIABLE n = 0
> >>yes? let n = `my_files,return=lend`
> >>  !-> DEFINE VARIABLE n = 0
> >>yes?
> >>
> >>Why is it so? Why do I not get n=4?
> >>I'm likely to have done just a stupid mistake somewhere, but I don't 
> >>see.
> >>
> >>Emilie
> >>
> >>
> >>
> >>
> >>____________________________________________________________
> >>Emilie VANVYVE
> >>Physicist, PhD student
> >>
> >>Université catholique de Louvain (UCL)
> >>Institut d'astronomie et de géophysique G. Lemaître (ASTR)
> >>Chemin du Cyclotron, 2
> >>1348 Louvain-la-Neuve (Belgium)
> >>Phone : +32-(0)10-473300
> >>Fax : +32-(0)10-474722
> >>E-mail : vanvyve@astr.ucl.ac.be
> >>Web : www.astr.ucl.ac.be
> >>    
> >>
> >
> >  
> >
> 

-- 
___________________________________________________

    Jaison Kurian                           
    Centre for Atmospheric and Oceanic Sciences
    Indian Institute of Science
    B A N G A L O R E   560 012
    Ph: +91-80-3942505
        +91-80-3600450
    Fax:+91-80-3600865
___________________________________________________