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Full Discussion: field separator in Perl
Top Forums Shell Programming and Scripting field separator in Perl Post 302306458 by KevinADC on Sunday 12th of April 2009 11:27:47 PM
Old 04-13-2009
Quote:
Originally Posted by ahsog
does this mean that the sort line will always have [1] or that it should be one number higher than the map line? eg. map [0] sort [1]; map [1] sort [2]
No. You use whatever index number in the sort block that is the correct one, could even be more than one. The general way is to store a copy of the original line(s) in index [0] in the first map block, and add additional fields as necessary for sorting the data. Then you sort them however your program requires, it could be field [1] or [2] or whatever. Then the last map block returns a copy of the original line in the sorted order. The last map block could also be used to further manipulate the data, it doesn't have to be used to just return a copy of the original data like your code is doing.
 

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LEARN ABOUT DEBIAN

ppmhist

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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