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Re: Writing to Multiple txt file with different names [message #94591 is a reply to message #94590]

Tue, 18 July 2017 06:40

Jim Pendleton
Messages: 165
Registered: November 2011

Senior Member

On Tuesday, July 18, 2017 at 7:12:18 AM UTC-6, 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.
>
> Thank you.

Try
openw, unit, ‘File_’+ i.tostring() + ‘.dat’, /get_lun

or if you're using an older version of IDL,
openw, unit, ‘File_’+ strtrim(i, 2) + ‘.dat’, /get_lun

The reason is that when the interpreter sees the "+" and a number, it will up-cast the other arguments in the expression to the highest precedence, rather than converting integers to strings.

Compare and contrast:
IDL> i = 10 & help, 'file_' + i + '.dat'
% Type conversion error: Unable to convert given STRING to Integer.
% Detected at: $MAIN$
% Type conversion error: Unable to convert given STRING to Integer.
% Detected at: $MAIN$
<Expression> INT = 10

IDL> i = 10 & help, '1' + i + '3'
<Expression> INT = 14

IDL> i = 10 & help, '1' + i + 30.0
<Expression> FLOAT = 41.0000

Jim P

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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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