Re: [ferret_users] Looping over multiple input files to plot file variables and save to png

[James Orr <James.Orr@xxxxxxxxxxxx>]

Paul,

Below is a quick example of how to loop over your filenames.

  let filenames = {spawn:"ls basinmasks"} !Vector of filenames
  let numfiles = `filenames,return=iend`  !Number of files

  can win/all

! Loop over list of filenames and make plot
  repeat/range=1:`numfiles`/name=in (let filename = filenames[i=`in`] ; \
        def sym filen basinmasks/`filename` ; \
	use ($filen)                        ; \
	set win/new                         ; \
	shade temp[k=1] )

! Note:
!  To test this example, I made a subdirectory, did a cd to that, and then
!  made symolic links of 2 files (fileA.nc, fileB.nc), both to
!  the same "levitus_climatology.cdf" file in the ferret distribution.

-- Jim

On Tue, 2 May 2017, Durack, Paul J. wrote:

> Thanks Russ, so how do I then loop over the entries:
>
>  
>
> let filenames = SPAWN("/bin/ls -1 basinmask/*.nc")
>
> ! How do I loop over filenames?
>
> !REPEAT/RANGE=1: ($filenames)
>
> !
>
> ! Then plot
>
> use ($filename)
>
> set win 1
>
> sha basinmask4
>
> frame/file="($outpath)($filename).png" ! How to I replace *.nc in the filename with *.png?
>
> cancel win 1
>
>  
>
> Cheers,
>
>  
>
> P
>
>  
>
> From: <owner-ferret_users@xxxxxxxx> on behalf of Russ Fiedler <russell.fiedler@xxxxxxxx>
> Date: Monday, May 1, 2017 at 5:36 PM
> To: "ferret_users@xxxxxxxx" <ferret_users@xxxxxxxx>
> Subject: Re: [ferret_users] Looping over multiple input files to plot file variables and save to png
>
>  
>
>
> Hi Paul,
>
> Rather than writing your filenames to a file you can create a variable using the SPAWN function directly.
>
> let filenames = SPAWN("/bin/ls -1 basinmask/*.nc")
>
> Another way would be to create the file as you are at the moment and read it in via a spawn and 'cat' command
>
> let filenames = SPAWN("cat filenames.txt")
>
> I'd prefer the first method.
>
> Cheers,
> Russ
>
> On 02/05/17 08:20, Durack, Paul J. wrote:
>
>       I have 51 netcdf files in a directory, and want to loop over each of these and for each plot the contents of a
>       gridded variable and save this to a png file, using pyferret 7.1
>
>        
>
>       I’ve been struggling with syntax, and am getting “**TMAP ERR: non-existent or not on line  filenames.txt”, with the
>       following partial code:
>
>        
>
>       spawn "ls basinmask/*.nc > filenames.txt" ! This is generating a file, but if I could create the filelist in memory
>       this step could be removed
>
>       FILE/FORMAT=DELIMITED/var="filenames" filenames.txt ! < This generates the error
>
>       say "processing: ",($file) ! don’t get to here
>
>        
>
>        
>
>       The plot and save command will be a simple:
>
>        
>
>       > sha basinmask4 ! Each file contains the same named variable
>
>       > frame/file=”($mypath)($myfile).png”
>
>        
>
>       Can someone help me out to fill in the missing logic/syntax here?
>
>        
>
>       Thanks,
>
>        
>
>       P
>
>  

--
LSCE/IPSL, Laboratoire des Sciences du Climat et de l'Environnement
CEA-CNRS-UVSQ

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