Hello all: I want to plot data point with specified color. The data file is the form: 1.3 1.3 1 2.2 2.1 2 2.4 2.3 3 3.2 1.2 4 1.2 5.2 5 There are three values each raw. The first two values corresponds to x and y , the position of a 2d plot. I want to use the third value to determine the color of the point. Do you have any suggestion to do so? Thanks very much.