XploRe Help : grsurfacecol

Keywords - Function groups - @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Library:	graphic
See also:	grxline gryline grlinreg grlinreg2

Quantlet:		grsurfacecol
Description:		generates a surface plot from a 3-dimensional dataset, with different color-levels depending on z-axis.

Link:

Introduction to the graphic library

Usage:	`gs = grsurfacecol(x, colors, nm)`
Input:
	`x`	n x 3 matrix containing user-defined data determining a grid
	`colors`	nm x 1 Color vector
	`nm`	Number of color levels
Output:
	`gs`	composed graphical object

Note:

The first two coordinates have to be on a grid such that #x-coordinates * #y-coordinates = n. The dataset x needs not to be sorted in any order.

Example:

library("graphic") x = grid(#(-3,-3), #(0.2,0.2), #(31,31)) f = exp(-0.5.*(x[,1]^2+x[,2]^2))./(2.*pi) freecolor() cl=grcolorscheme("color",10) createcolor(cl) gs = grsurfacecol(x~f,cl,9) d = createdisplay(1,1) show(d, 1, 1, gs)

Result:

shows a surface plot with 9 color-levels using colorscheme "color"

Author: M. Benko, 20000122