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Full Discussion: Search and replace with a sliding window
Top Forums UNIX for Dummies Questions & Answers Search and replace with a sliding window Post 302907340 by bakunin on Friday 27th of June 2014 09:51:01 AM
Old 06-27-2014
Quote:
Originally Posted by Fahmida
(2)Form a 3 letter window and slide 1 letter at a time; check for the patten described above until finish replacing.
To be honest, i have troubles understanding the exact meaning of this. I suppose you want to work on different reading frames.

Because there are only 3 of them (using "T" as any triplett and "B" for any single base there is only "TTT...", "BTTT..." and "BBTTT...") you will not need a sliding window.

Second, because of your first replacements a pattern could match where it hasn't matched before in subsequent passes. Suppose your line is:

Code:
DDGG

Because it will not match "DDG" the triplett 2-4 would not be replaced. Once triplett 1-3 would be replaced, it would match, though:

Code:
DDGG        # replace "DDG" with "DD!"
DD!G        # after first replacement, now prelace "2 not-Gs, then G" again
DD!!        # after second pass

Analogous for your other replacement rules. Somehow i doubt that this is what you really want. Please clarify.

I hope this helps.

bakunin
 

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LEARN ABOUT OPENSOLARIS

ppmtosixel

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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