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/*

 *

 * An interval list used to map matrix elements into integers in the range 0 to

 * 254 representing shades of gray on a PostScript printer. The list can be given

 * using the -i option or can be set in the optional header that can preceed each

 * matrix. The list should be a comma or space separated list that looks like,

 *

 *		num1,num2, ... ,numn

 *

 * where each num is a floating point number. The list must be given in increasing

 * numerical order. The n numbers in the list partion the real line into 2n+1

 * regions given by,

 *

 *		region1		element < num1

 *		region2		element = num1

 *		region3		element < num2

 *		region4		element = num3

 *		   .		     .

 *		   .		     .

 *		   .		     .

 *		region2n	element = numn

 *		region2n+1	element > numn

 *

 * Every number in a given region is mapped into an integer in the range 0 to 254

 * and that number, when displayed on a PostScript printer using the image operator,

 * prints as a square filled with a gray scale that reflects the integer that was

 * chosen. 0 maps to black and 255 white (that's why 255 is normally omitted).

 *

 * The shades of gray chosen by the program are normally generated automatically,

 * but can be reassigned using the -g option or by including a grayscale line in

 * the optional header. The grayscale list is comma or space separated list of

 * integers between 0 and 255 that's used to map individual regions into arbitray

 * shade of gray, thus overriding the default choice made in the program. The list

 * should look like,

 *

 *		color1,color2, ... ,color2n+1

 *

 * where color1 applies to region1 and color2n+1 applies to region2n+1. If less

 * than 2n+1 numbers are given the default assignments will be used for the missing

 * regions. Each color must be an integer in the range 0 to 255.

 *

 * The default interval list is given below. The default grayscale maps 254 (almost

 * white) into the first region and 0 (black) into the last.

 *

 */

#define DFLTILIST	"-1,0,1"

/*

 *

 * The active interval list is built from an interval string and stored in an array

 * whose elements are of type Ilist.

 *

 */

typedef struct  {

	double	val;			/* only valid in kind is ENDPOINT */

	int	color;			/* gray scale color */

	long	count;			/* statistics for each region */

} Ilist;

/*

 *

 * Non-integer function declarations.

 *

 */

char	*savestring();