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Full Discussion: Read values in each col starting 3rd row.Print occurrence value.
Homework and Emergencies Emergency UNIX and Linux Support Read values in each col starting 3rd row.Print occurrence value. Post 302970691 by Don Cragun on Sunday 10th of April 2016 07:42:10 PM
Old 04-10-2016
In the secondary output:
Code:
0=12times
1=3times
2=4times
3=4times
4=2times

where do these numbers come from?

If you're counting the number of times a digit appears in the input, 0 occurs 13 times (not 12 times) in your sample input. If you're counting the number of times a value appears in your sample input, 0 (or 00) does not appear at all???

All of your input values are two digit strings. Are we supposed to treat 01 and 1 as the same value or as distinct values? If they are the same, is 010 to be treated as an octal value (decimal 8) or as a decimal value (10)?
 

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LEARN ABOUT V7

ppmdist

ppmdist(1)						      General Commands Manual							ppmdist(1)

NAME

       ppmdist - simplistic grayscale assignment for machine generated, color images

SYNOPSIS

       ppmdist [-intensity|-frequency] [ppmfile]

DESCRIPTION

       Reads a portable pixmap as input, performs a simplistic grayscale assignment intended for use with grayscale or bitmap printers.

       Often conversion from ppm to pgm will yield an image with contrast too low for good printer output.  The program maximizes contrast between
       the gray levels output.

       A ppm input of n colors is read, and a pgm of n gray levels is written.	The gray levels take on the values 0..n-1, while maxval  takes	on
       n-1.

       The mapping from color to stepped grayscale can be performed in order of input pixel intensity, or input pixel frequency (number of repeti-
       tions).

OPTIONS

       -frequency    Sort input colors by the number of times a color appears in the input, before mapping to  evenly  distributed  graylevels	of
		     output.   -intensity  Sort input colors by their grayscale intensity, before mapping to evenly distributed graylevels of out-
		     put.  This is the default.

BUGS

       Helpful only for images with a very small number of colors.  Perhaps should have been an option to ppmtopgm(1).

SEE ALSO

       ppmtopgm(1), ppmhist(1), ppm(5)

AUTHOR

       Copyright (C) 1993 by Dan Stromberg.

								   22 July 1992 							ppmdist(1)
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