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Full Discussion: Average of arguments
Top Forums Shell Programming and Scripting Average of arguments Post 25967 by TalkShowHost on Thursday 8th of August 2002 08:47:56 AM
Old 08-08-2002
Average of arguments

I have a program where the user enters numbers as arguments and it calculates the average, but it only works when i have a set amount of arguments that can be entered. How can i alter my script so that the user can enter as many arguments as he wishes?
 

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pnmconvol(1)                                                  General Commands Manual                                                 pnmconvol(1)

NAME
pnmconvol - general MxN convolution on a portable anymap SYNOPSIS
pnmconvol convolutionfile [pnmfile] DESCRIPTION
Reads two portable anymaps as input. Convolves the second using the first, and writes a portable anymap as output. Convolution means replacing each pixel with a weighted average of the nearby pixels. The weights and the area to average are determined by the convolution matrix. The unsigned numbers in the convolution file are offset by -maxval/2 to make signed numbers, and then normalized, so the actual values in the convolution file are only relative. Here is a sample convolution file; it does a simple average of the nine immediate neighbors, resulting in a smoothed image: P2 3 3 18 10 10 10 10 10 10 10 10 10 To see how this works, do the above-mentioned offset: 10 - 18/2 gives 1. The possible range of values is from 0 to 18, and after the off- set that's -9 to 9. The normalization step makes the range -1 to 1, and the values get scaled correspondingly so they become 1/9 - exactly what you want. The equivalent matrix for 5x5 smoothing would have maxval 50 and be filled with 26. The convolution file will usually be a graymap, so that the same convolution gets applied to each color component. However, if you want to use a pixmap and do a different convolution to different colors, you can certainly do that. At the edges of the convolved image, where the convolution matrix would extend over the edge of the image, pnmconvol just copies the input pixels directly to the output. SEE ALSO
pnmsmooth(1), pnm(5) AUTHORS
Copyright (C) 1989, 1991 by Jef Poskanzer. Modified 26 November 1994 by Mike Burns, burns@chem.psu.edu 26 November 1994 pnmconvol(1)
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