Dear friends, I have three variables ,x,y and z, and i want to get two plots: 1.three-dimensionel plot: z is the vertical axis, x and y is on the same horizontal plane; 2.contour plot:x is the horizontal axis, and y is vertical axis, and z is used to plot the contour line. I can't finish it ,anybody can help me ? Thanks in advance. -- With Kind Regards, Zhi Jie,Zhang [[alternative HTML version deleted]]