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Re: Writing to Multiple txt file with different names [message #94592 is a reply to message #94590]

Tue, 18 July 2017 06:42

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Tuesday, July 18, 2017 at 9:12:18 AM UTC-4, thtr...@gmail.com wrote:
> Hello everybody,
>
> I need to write my data to a bunch of different files, ideally with 'consecutive' names, such as File 1, File 2, File 3, .. so on (up to thousands of text files)
>
> Here's my attempt:
>
> get_lun, unit
> for i = 1,1000 do begin
> openw, unit, ‘File_’+ i + ‘.dat’, /get_lun
> printf, unit, 'my data will go in here'
> endfor
>
> IDL keeps saying filename argument must be a scalar string.
> Any help would be appreciated.
>

Problem 1. You need to use "straight" quotes. You are using something like Microsoft word or some notepads that use curly quotes. IDL uses straight quotes.

Problem 2. The string 'File_'+i+'.dat' won't work because you are combining an integer and string. You could use 'File_'+strtrim(i,2)+'.dat' or use STRING() with a FORMAT= argument.

Problem 3. You are using GET_LUN once at the top of your loop and again for each loop. You never close any files. Use FREE_LUN at the end of your loop.

CM

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[Message index]

		Writing to Multiple txt file with different names By: thtran296 on Tue, 18 July 2017 06:12
		Re: Writing to Multiple txt file with different names By: Jim Pendleton on Tue, 18 July 2017 06:40
		Re: Writing to Multiple txt file with different names By: Craig Markwardt on Tue, 18 July 2017 06:42

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