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Full Discussion: simple array problem
Top Forums Shell Programming and Scripting simple array problem Post 302467451 by enes71 on Friday 29th of October 2010 11:38:18 AM
Old 10-29-2010
a slight change and comparison of each array value
Hello again experts;

I have been working on my code to make it multitask. I deleted unnecessary fields in my input file, here is the last version;

Code:
1716978 7451870 -60 00:3A:98:B6:E3:B0     
1716978 7451870 -61 00:3A:98:B6:E3:B0     
1716978 7451870 -63 00:3A:98:B6:E3:B0     
1716978 7451870 -73 00:3A:98:B6:E3:B0     
1716978 7451870 -65 00:3A:98:B6:E3:B0     
1716978 7451869 -54 00:3A:98:B6:E3:B0     
1716977 7451868 -52 00:3A:98:B6:E3:B0     
1716978 7451867 -52 00:3A:98:B6:E3:B0     
1716985 7451866 -52 00:3A:98:B6:E3:B0     
1716990 7451865 -52 00:3A:98:B6:E3:B0     
1716978 7451864 -52 00:3A:98:B6:E3:B0     
1716979 7451863 -52 00:3A:98:B6:E3:B0     
1716979 7451864 -52 00:3A:98:B6:E3:B0     
1716978 7451865 -53 00:3A:98:B6:E3:B0     
1716978 7451865 -44 00:3A:98:B6:E3:B0     
1716978 7451866 -44 00:3A:98:B6:E3:B0

Suppose 1st field is X and 2nd field is Y. If I treat them in a 2 dimensional coordinate system, each record has its own point as X and Y. What I would like to do is to compare each points in each record and report if there is a 5 meter change. I would like to do this using awk and arrays. It will be comparison of each value with the previous one and if there is a change, make an array for changed instances.
Here is my code;

Code:
{
   rssi[FNR]=$3
   mac[FNR]=$4
   pos[FNR]=sqrt(($1^2)+($2^2))
   fnr=FNR
}
END {
        for (i=1;i<=fnr;i++)
        {
                if ((pos[i]-pos[i-1])>5 && (pos[i]-pos[i-1])<-5)
                pos_changed[i]=pos[i]             #I would like to assign changed values into different array.      
        }
        for (i=1;i<=fnr;i++)
        print pos_changed[i]                        #at last, reporting the changes
}

Output of this code is nothing actually, blank page and then command window again...
I think I have a problem in assigning the changed value. I searched a lot in the forum but there is no exact problem, similar but not helpful for my code.

I am looking forward to see your feedbacks again.
Regards.
 

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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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