1*7dd7cddfSDavid du Colombier 2*7dd7cddfSDavid du ColombierA program that displays a matrix as a gray scale image on PostScript 3*7dd7cddfSDavid du Colombierprinters. May be useful if you have a large matrix and want a simple 4*7dd7cddfSDavid du Colombierway to look for patterns. Expect a 600x600 matrix is an optimistic 5*7dd7cddfSDavid du Colombierupper limit on a 300 dpi printers using 5 shades of gray and 8.5x11 6*7dd7cddfSDavid du Colombierinch paper. 7*7dd7cddfSDavid du Colombier 8*7dd7cddfSDavid du ColombierMatrix elements are a series of floating point numbers arranged in 9*7dd7cddfSDavid du Colombierthe input file in row major order. By default each matrix is assumed 10*7dd7cddfSDavid du Colombierto be square and the number of rows (and columns) is set to the square 11*7dd7cddfSDavid du Colombierroot of the number of elements in the input file. White space, including 12*7dd7cddfSDavid du Colombiernewlines, is not used to determine the matrix dimensions. Each matrix 13*7dd7cddfSDavid du Colombierelement is mapped into an integer in the range 0 to 255 (254 by default) 14*7dd7cddfSDavid du Colombierand PostScript's image operator maps that integer into a gray scale 15*7dd7cddfSDavid du Colombierappropriate for the printer. 16*7dd7cddfSDavid du Colombier 17*7dd7cddfSDavid du ColombierThe mapping from floating point matrix elements to integers is controlled 18*7dd7cddfSDavid du Colombierby an interval list and grayscale map. The default interval list is 19*7dd7cddfSDavid du Colombier"-1,0,1" which partitions the real line into 7 regions. The default 20*7dd7cddfSDavid du Colombiergrayscale map gets darker as the regions move from left to right along 21*7dd7cddfSDavid du Colombierthe real line. The -i option changes the interval list and the -g option 22*7dd7cddfSDavid du Colombiermodifies the grayscale mapping. Check the man page for more details. 23*7dd7cddfSDavid du Colombier 24