[ncl-talk] loop over a unique filename

[Dennis Shea]

Please see:

http://www.ncl.ucar.edu/Document/Functions/Built-in/sprinti.shtml

do y=1,1000

   input="/dir/data"+sprinti("%0.4i", i) +".nc"
   f = addfile(input, "r")
     :
     :
end do



On Tue, Jul 12, 2016 at 8:18 AM, Thomas Tobian <thomastobian at gmail.com>
wrote:

> 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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