Slow FFT in ksh93 and awk. Post: 303023213

Sponsored Content

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

09-13-2018

Registered User

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:

wisecracker

View Public Profile for wisecracker

Find all posts by wisecracker

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

echo is too slow. HELP with Awk

Hello All, Below is a simple script i worte to find the 208th char in a file. If the char = "C" then I re-direct the line to a file called change.txt. If it is not "C" then I re-direct it to a file called delete.txt. My problem is I have a file 0f 500K lines. this script is very slow. I am...

2. Shell Programming and Scripting

ksh93 deprecation...

Any means of running ksh93 in a ksh88-mode? Might sound odd, but I want/need to restrict U/Win-developed scripts to correspond to the ksh88 version on my Solaris environment(s). Thanks.

3. Shell Programming and Scripting

ksh88 or ksh93

Hi all! Does anybody know how can I check if any UNIX installation has implemented ksh88 or ksh93? Thanks in advance. N�stor.

4. Shell Programming and Scripting

The builtin split function in AWK is too slow

I have a text file that contains 4 million lines, each line contains 2 fields(colon as field separator). as shown: 123:444,555,666,777,888,345 233:5444,555,666,777,888,345 623:454,585,664,773,888,345 ...... Here I have to split the second field(can be up to 40,000 fields) by comma into an...

5. Shell Programming and Scripting

cut, sed, awk too slow to retrieve line - other options?

Hi, I have a script that, basically, has two input files of this type: file1 key1=value1_1_1 key2=value1_2_1 key4=value1_4_1 ... file2 key2=value2_2_1 key2=value2_2_2 key3=value2_3_1 key4=value2_4_1 ... My files are 10k lines big each (approx). The keys are strings that don't...

6. Shell Programming and Scripting

Making a faster alternative to a slow awk command

Hi, I have a large number of input files with two columns of numbers. For example: 83 1453 99 3255 99 8482 99 7372 83 175 I only wish to retain lines where the numbers fullfil two requirements. E.g: =83 1000<=<=2000 To do this I use the following...

7. UNIX for Advanced & Expert Users

Ksh93 on Linux compatible with ksh93 on AIX

Hi Experts, I have several shell scripts that have been developed on a Linux box for korn ksh93. If we want to run this software on an AIX 6.1 box that runs ksh88 by default can we just change the she-bang line to reference /bin/ksh93 which ships with AIX as its "enhanced shell" to ensure...

8. OS X (Apple)

FFT for the AMIGA through ksh88 shell.

I don't know if anyone is interested but I have been meddling with FFT for the AMIGA. (Sadly we AMIGAns don't have these luxuries through any scripting language. Below is a Python snippet that uses the builtin 'cmath' module to work with the lowly Python 2.0.1 for the AMIGA. It is part of a...

9. AIX

Ksh93/AIX compatibility

Hi everyone ! Im trying to know from wich version of AIX KSH93 is available ? Internet tell me 6.x and 7.x AIX are available, bue what about 5.x ? Is KSH93 available on AIX 5.x ? Is it the same way to manipulate variables as KSH93 on 7.x ? Thanks for your support and have a nice day !

10. OS X (Apple)

FFT for Python 2.0.x to 3.7.0.

Hi guys... This is code that was originally designed to work on an upgraded AMIGA A1200 using Python 2.0.x. Unfortunately it broke inside much later versions, NOT because of the print statement/function but other minor subtleties. So this is the final result tested on various machines including...

LEARN ABOUT SUNOS

setcolor

setcolor(1F)							   FMLI Commands						      setcolor(1F)

NAME

       setcolor - redefine or create a color

SYNOPSIS

       setcolor color red_level green_level blue_level

DESCRIPTION

       The  setcolor  command  takes four arguments: color, which must be a string naming the color; and the arguments red_level, green_level, and
       blue_level, which must be integer values defining, respectively, the intensity of the red, green, and blue components of  color.   Intensi-
       ties  must  be  in the range of 0 to 1000. If you are redefining an existing color, you must use its current name (default color names are:
       black, blue, green, cyan, red, magenta, yellow, and white). setcolor returns the color's name string.

EXAMPLES

       Example 1: A sample output of setcolor command.

       The following is an example of the arguments that setcolor takes:

       `setcolor blue 100 24 300`

       BUILT-IN FMLI

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

SunOS 5.10							    5 Jul 1990							      setcolor(1F)