【例6.4-1】本例演示：pcolor , contour, contourf的调用格式；等位线标高指令 clabel 的配合使用和区别；colorbar在用户指定位置上创建着色标尺；subplot子图位置的控制；图形窗背景底色的设置。（图6.4-1）-Example 6.4-1 This example demonstrates: pcolor, contour, contourf' s call format　the bit line elevation instruction clabel of the used in conjunction with, and differences in the user-specified location　colorbar create coloring ruler　of the subplot subgraph location control　graphics window Background background settings. (Figure 6.4-1)