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Full Discussion: Slow FFT in ksh93 and awk.
Operating Systems OS X (Apple) Slow FFT in ksh93 and awk. Post 303023213 by wisecracker on Thursday 13th of September 2018 03:49:45 AM
Old 09-13-2018
Pur awk FFT.

Quote:
Originally Posted by Corona688
Another thing you can do to speed it up is keep it running - feed it input and read it output at need, rather than starting and killing it all the time. How to do that depends on what your input data would look like and what you'd want for your output data.
There is one error and corrected for the correct results, note the minus sign in red:
SUMIMAG += -REAL_ARRAY[T]*SIN_ANGLE + IMAG_ARRAY[T]*COS_ANGLE;
Correct results:
Code:
Real:
 8.50 3.64 -1.71 0.05 1.50 -0.17 -0.29 0.48 0.50 0.48 -0.29 -0.17 1.50 0.05 -1.71 3.64
Imaginary:
 0.00 -1.93 -0.50 -0.24 -1.00 0.47 0.50 -1.22 0.00 1.22 -0.50 -0.47 1.00 0.24 0.50 1.93

Otherwise phenominal.
Thanks a lot...
(This has taught me more about awk than ANY tutorial or info from the mighty WWW and for that I can only say thank you.)

Last edited by wisecracker; 09-14-2018 at 07:44 AM.. Reason: Add title.
This User Gave Thanks to wisecracker For This Post:
 

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Color::Calc::WWW(3pm)					User Contributed Perl Documentation				     Color::Calc::WWW(3pm)

NAME
Color::Calc::WWW - Simple calculations with colors for the WWW. SYNOPSIS
use Color::Calc::WWW; my $background = 'green'; print 'background: ', color($background),';'; print 'border-top: solid 1px ', color_light($background),';'; print 'border-bottom: solid 1px ', color_dark($background),';'; print 'color: ', color_contrast_bw($background),';'; DESCRIPTION
The "Color::Calc::WWW" module implements simple calculations with RGB colors for the World Wide Web. This can be used to create a full color scheme from a few colors. This module is nearly identical to using the following: use Color::Calc('ColorScheme' => 'WWW', 'OutputFormat' => 'html'); However, this module also makes the functions available when not imported: use Color::Calc::WWW(); # don't import Color::Calc::WWW::color('F00'); USAGE
By default, all functions are imported. All functions recognize all HTML color keywords (through Graphics::ColorNames::WWW) and output the results in WWW-compatible formats, i.e. as one of the 16 basic HTML keywords (see Graphics::ColorNames::WWW) or as #RRGGBB. color, color_mix, ... See L<Color::Calc> for a list of available calculation functions. NOTE
AUTHOR
Claus Faerber <CFAERBER@cpan.org> LICENSE
Copyright 2004-2010 Claus Faerber. This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2012-06-30 Color::Calc::WWW(3pm)
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