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A program that displays a matrix as a gray scale image on PostScript
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printers. May be useful if you have a large matrix and want a simple
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way to look for patterns. Expect a 600x600 matrix is an optimistic
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upper limit on a 300 dpi printers using 5 shades of gray and 8.5x11
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inch paper.
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Matrix elements are a series of floating point numbers arranged in
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the input file in row major order. By default each matrix is assumed
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to be square and the number of rows (and columns) is set to the square
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root of the number of elements in the input file. White space, including
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newlines, is not used to determine the matrix dimensions. Each matrix
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element is mapped into an integer in the range 0 to 255 (254 by default)
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and PostScript's image operator maps that integer into a gray scale
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appropriate for the printer.
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The mapping from floating point matrix elements to integers is controlled
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by an interval list and grayscale map. The default interval list is
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"-1,0,1" which partitions the real line into 7 regions. The default
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grayscale map gets darker as the regions move from left to right along
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the real line. The -i option changes the interval list and the -g option
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modifies the grayscale mapping. Check the man page for more details.
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