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How to fasten formatted printf? [message #92524]

Mon, 04 January 2016 18:01

enod
Messages: 41
Registered: November 2004

Member

Hi all,

I usually have over a thousand text files to write. Each file contains 9 columns and several thousand lines. The below is a test.

PRO TEST_PRINTF_FORMATTED_LARGE
ofile='c:\test.txt'
data=DBLARR(9,7000)

t0=SYSTIME(/seconds)
OPENW,fid,ofile,/get_lun
PRINTF,fid,data,format='((3(1x,f10.5),1x,3(1x,f8.2),1x,3(1X, f4.1)))'
FREE_LUN,fid
DELTA_T=SYSTIME(1)-T0*1d0
PRINT,'Total time: '+STRING(DELTA_T,FORMAT='(f)')+' seconds'
END

On my notebook, it takes about 0.14 seconds to finish the above task, e.g.

% Compiled module: TEST_PRINTF_FORMATTED_LARGE.
Total time: 0.1449999809265137 seconds
% Compiled module: TEST_PRINTF_FORMATTED_LARGE.
Total time: 0.1349999904632568 seconds
% Compiled module: TEST_PRINTF_FORMATTED_LARGE.
Total time: 0.1500000953674316 seconds

For 1000 files, it will take over 2 minutes. I wonder whether there is a way to do it very quickly.

Thank you very much!

Yunfeng Tian

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[Message index]

		How to fasten formatted printf? By: enod on Mon, 04 January 2016 18:01
		Re: How to fasten formatted printf? By: Craig Markwardt on Mon, 04 January 2016 18:53
		Re: How to fasten formatted printf? By: Jeremy Bailin on Tue, 05 January 2016 08:34
		Re: How to fasten formatted printf? By: markb77 on Tue, 05 January 2016 09:57

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