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Full Discussion: Interpolation using awk
Top Forums Shell Programming and Scripting Interpolation using awk Post 302618417 by Scrutinizer on Wednesday 4th of April 2012 02:17:27 AM
Old 04-04-2012
Hi,

Some pointers:

array P contains the array of points, x is the index
array I contains the sequence of x coordinates

These arrays get filled while processing the file
After that is done then the standard interpolation and extrapolation (there is no real difference) is done in the print statement for all enumerated points and virtual points..
If the enumerated point is beyond a threshold then the points on the basis of which the inter/extrapolation is calculated is switched to the next set..

You could perhaps visualize this by drawing a line with the points on a piece of paper and indicate the known points and then figure out how you would calculate the inter/extrapolated value and what set of points you would use for that...

Last edited by Scrutinizer; 04-05-2012 at 01:08 AM..
This User Gave Thanks to Scrutinizer For This Post:
 

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ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME
ppmtosixel - convert a portable pixmap into DEC sixel format SYNOPSIS
ppmtosixel [-raw] [-margin] [ppmfile] DESCRIPTION
Reads a portable pixmap as input. Produces sixel commands (SIX) as output. The output is formatted for color printing, e.g. for a DEC LJ250 color inkjet printer. If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled. A printer control header and a color assignment table begin the SIX file. Image data is written in a compressed format by default. A printer control footer ends the image file. OPTIONS
-raw If specified, each pixel will be explicitly described in the image file. If -raw is not specified, output will default to com- pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands. A raw file is often an order of magni- tude larger than a compressed file and prints much slower. -margin If -margin is not specified, the image will be start at the left margin (of the window, paper, or whatever). If -margin is speci- fied, a 1.5 inch left margin will offset the image. PRINTING
Generally, sixel files must reach the printer unfiltered. Use the lpr -x option or cat filename > /dev/tty0?. BUGS
Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion. If the original PPM maxval was greater than 100, rescaling also reduces the image depth. While the actual RGB values from the ppm file are more or less retained, the color palette of the LJ250 may not match the colors on your screen. This seems to be a printer limitation. SEE ALSO
ppm(5) AUTHOR
Copyright (C) 1991 by Rick Vinci. 26 April 1991 ppmtosixel(1)
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