[ncl-talk] loop over a unique filename

[Thomas Tobian]

Try this:

do y=1,1000

if (y.lt.10) then
  year="000"+y
else if (y.ge.10.and.y.lt.100)
  year="00"+y
else if (y.ge.100.and.y.le.999)
  year="0"+y
else
  year=y
end if
end if
end if

input="/dir/data"+year+".nc"
.
.
.

end do

Cheers,
Thomas

On Tue, Jul 12, 2016 at 3:54 PM, Alexander Schaefer <aschae11 at uncc.edu>
wrote:

> Just use an If statement.
>
> do t = 1,1
>
> if (t .lt. 10) then
>   input="/dir/data.000”+t +”.nc”
> else if (t .lt. 100) then
>   input="/dir/data.00”+t +”.nc"
> else if (t .lt. 1000) then
>    input="/dir/data.0"+t +”.nc”
> else
>   input="/dir/data.” + t +”.nc"
> end if
> end if
> end if
>
> file = addfile(input,”r”)
>
> end do
>
> I would set the filename in the if statements and load the file after
> them; all done within the loop
>
> Other option is
>
> ifiles = systemfunc( “ls /dir/data.*.nc”) ; This gets all of your data
> file names
>
> nfiles = dimsizes(ifiles)
>
> do t = 0, nfiles-1
>
>   ifile = addfile(ifiles(t), “r”)
>
>  ; Now do your work
>
> end do
>
>
> the latter option is smoother but either should work for the purpose.
>
> -Alex
>
>
>
>
> On Jul 12, 2016, at 9:44 AM, Kacie Shourd <Kacie.Shourd at dri.edu> wrote:
>
> Hi, Chang
>
> I have yet to figure out how to loop through files in such a way using
> purely NCL. There is the "addfiles" function, but I don't believe that
> loops through files -- it just pulls in the variables from all files and
> I'm not sure how to keep things separate.
>
> I have handled this problem in the past by using a wrapper in an external
> language (Python, for example), and running things directly from the shell.
> Looping in other languages is much more straight forward (in my opinion),
> and shouldn't be too difficult to accomplish.
>
> If you need assistance doing this, I would be happy to lend a hand/provide
> an example.
>
> Best,
> Kacie
>
> ---
> Kacie N. Shourd
> 드림
>
>
> Graduate Research Assistant
> Desert Research Institute
> Kacie.Shourd at dri.edu
> Work: (775) 674-7049
>
> ------------------------------
> *From:* ncl-talk-bounces at ucar.edu [ncl-talk-bounces at ucar.edu] on behalf
> of Xi Chang [xi.chang01 at gmail.com]
> *Sent:* Tuesday, July 12, 2016 6:34 AM
> *To:* ncl-talk at ucar.edu
> *Subject:* [ncl-talk] loop over a unique filename
>
> Dear NCL,
>
> I have a unique *nc file like this (with increment 1):
>
> data.0001.nc
> data.0002.nc
> data.0003.nc
> .
> .
> data.0010.nc
> data.0011.nc
> data.0012.nc
> .
> .
> .
> data.0101.nc
> data.0102.nc
>
> I want to call this data using a loop, something like this:
>
> t=1,1
>
> input="/dir/data.000+"t".nc
>
> but it doesnt work when then zero is reduced infront of the filename.
> anys suggestion how to call this files on a loop?
>
> Thanks
>
> Chang
>
>
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