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Full Discussion: Converting rows to column
Top Forums Shell Programming and Scripting Converting rows to column Post 302634399 by rbatte1 on Thursday 3rd of May 2012 09:44:36 AM
Old 05-03-2012
You statement of
Code:
echo "$a, \c" >>sample.txt

...would actually generate a comma&space separated file. I presume you mean:-
Code:
echo "$a,\c" >>sample.txt

followed by a plain echo at the end of the process.


Anyway, this indirect phrase I used.

If you are using ksh, then the arrays are limited to being one dimensional, i.e. you can only specify one ordinate. If you could specify two, then this would be easier. The logic would work that if you had arrays A and gave them ordinates x & y in a reference that identified a single value as A[x,y] then we could load the array by using a pair of loops like this (not runnable code)
Code:
x=1
y=1

until [ $x -ge 15 ]
do
   until [ $y -gt 15 ]
   do
      {read value into A[$x,$y]}
      {increment y}
   done
   {increment x}
done

Then you could write the data out again looping the other way around, such as:-
Code:
x=1
y=1

until [ $y -ge 15 ]
do
   until [ $x -gt 15 ]
   do
      {write value from A[$x,$y]}
      {increment x}
   done
   {increment y}
done


If your shell does not support two diminsional arrays (such as ksh need to check ksh93) we may have to be more inventive. The indirect variable would be a way of trying to use a variable as a variable name, so you make one of the ordinates part of the variable, so if the 2D array is A you would actually define a set of 1D arrays, A1, A2, A3, A4, ...... for as many values of x as you would have. You could then refer to $A3[5] as being array cell 3,5 as it were. The trick is how to get the array name as a variable. It could get messy.

It depends how one would write something like:-
Code:
echo "${A$x[$y]}"

.... which I'm not sure how to code up.

I'm not sure if this helps, but it may bring further suggestions - and I may learn something too!



Robin
Liverpool/Blackburn
UK
 

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LEARN ABOUT V7

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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