tailieunhanh - MATLAB Demystified phần 4

Một số những yếu tố này là diễn viên kinh doanh, trường hợp sử dụng kinh doanh và nhân viên kinh doanh. Chúng tôi sẽ thảo luận về những điều này và cho bạn thấy làm thế nào để mô hình chúng bằng cách sử dụng 2. Chọn Báo cáo → Hiển thị tham gia trong UC. | CHAPTER 3 Plotting and Graphics Figure 3-41 A contour plot of z ye 1 y2 By adding the following surface command we can spruce up the appearance of this plot quite a bit surface x y z EdgeColor .8 .8 .8 FaceColor none grid off view -15 20 Figure 3-42 Three-dimensional contour plot of z ye-x y 90 MATLAB Demystified Figure 3-43 A dressing up of the contour plot using surface to show the surface plot of the function along with the contour lines The result shown in Figure 3-43 is reminiscent of the kinds of three-dimensional images you might see in your calculus book. Three-Dimensional Plots We have already seen a hint of the three-dimensional plotting capability using MATLAB when we considered the surface command. We can generate threedimensional plots in MATLAB by calling mesh x y z . First let s try this with z cos x sin y and -2p x y 2p We enter x y meshgrid -2 pi 2 pi z cos x . sin y mesh x y z xlabel x ylabel y zlabel z If you look at the final statement you can see that mesh is just an extension of plot x y to three dimensions. The result is shown in Figure 3-44. Let s try it using z ye y2 with the same limits used in the last section. We enter the following commands x y meshgrid -2 2 z y. exp -x. 2-y. 2 mesh x y z xlabel x ylabel y zlabel z CHAPTER 3 Plotting and Graphics Figure 3-44 Plotting z cos x sin y using the mesh command This plot is shown in Figure 3-45. Now let s plot the function using a shaded surface plot. This is done by calling either surf or surfc. Simply changing the command used in the last example to surf x y z xlabel x ylabel y zlabel z Figure 3-45 Plot of z ye x2 y2 generated with .