03-26-2010
ordering a data file
With an input file like this:
Quote:
_1.012E+01_2.102E+04_3.222E+03_4.100E+02
-1.144E+02-2.489E-02_5.444E+01-3.122E-03
-3.566E+00_7.455E+04-4.326E+03_7.834E+00
How can I get an output like this?
Quote:
_1.102E+01
_2.102E+04
_3.222E+03
_4.100E+02
-1.144E+02
-2.489E-02
...
7.834E+00
(In the quoted examples, the "_" sign represents an empty space)
Note that there are some minus signs and no spaces, in the example above the first character of the first line is an empty space, so each number spans 10 characters.
With the command cut -c1-10 I can get the correct numbers but only the first column of the input file, and I don't know how to reorder the numbers.
Any suggestions?
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LEARN ABOUT REDHAT
ppmtopgm
ppmtopgm(1) General Commands Manual ppmtopgm(1)
NAME
ppmtopgm - convert a portable pixmap into a portable graymap
SYNOPSIS
ppmtopgm [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Produces a portable graymap as output. The output is a "black and white" rendering of the original
image, as in a black and white photograph. The quantization formula used is .299 r + .587 g + .114 b.
Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any ppm program can
read pgm (and pbm ) files automatically. pgmtoppm is for colorizing a pgm file. Also, see ppmtorgb3 for a different way of converting
color to gray. And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate the original
colors, not necessarily a way that looks like a black and white photograph.
QUOTE
Cold-hearted orb that rules the night
Removes the colors from our sight
Red is gray, and yellow white
But we decide which is right
And which is a quantization error.
SEE ALSO
pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)
AUTHOR
Copyright (C) 1989 by Jef Poskanzer.
10 April 2000 ppmtopgm(1)