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Top Forums UNIX for Dummies Questions & Answers Filling positions based on frequency Post 302947668 by Don Cragun on Saturday 20th of June 2015 03:46:51 AM
Old 06-20-2015
I apologize. Further testing showed that I have some code backwards. Testing with the sample data didn't catch it. Testing it with more data looking for corner cases made it immediately obvious that the two lines close to the end of the script:
Code:
                        $0 = (i > 1 ? substr($0, i - 1, 1) : "") rep[i] \
                                substr($0, i + 1)

should be changed to:
Code:
                        $0 = (i > 1 ? substr($0, 1, i - 1) : "") rep[i] \
                                substr($0, i + 1)

Note: This problem has now been fixed in the previous post so you if you download the entire script now, you won't have to patch it.

Last edited by Don Cragun; 06-20-2015 at 05:05 AM.. Reason: Add note.
This User Gave Thanks to Don Cragun For This Post:
 

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ppmhist(1)						      General Commands Manual							ppmhist(1)

NAME
ppmhist - print a histogram of a portable pixmap SYNOPSIS
ppmhist [-hexcolor] [-noheader] [-map] [-nomap] [-sort={frequency,rgb}] [ppmfile] DESCRIPTION
Reads a PPM image as input. Generates a histogram of the colors in the image, i.e. a list of all the colors and how many pixels of each color are in the image. OPTIONS
-sort={frequency,rgb} The -sort option determines the order in which the colors are listed in the output. frequency means to list them in order of how pixels in the input image have the color, with the most represented colors first. rgb means to sort them first by the intensity of the red component of the color, the of the green, then of the blue, with the least intense first. The default is frequency. -hexcolor Print the color components in hexadecimal. Default is decimal. -noheader Do not print the column headings. -map Generates a PPM file of the colormap for the image, with the color histogram as comments. -nomap Generates the histogram for human reading. This is the default. SEE ALSO
ppm(5), pgmhist(1), ppmtomap(1), pnmhistmap(1), ppmchange(1) AUTHOR
Copyright (C) 1989 by Jef Poskanzer. 17 September 2000 ppmhist(1)
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