画散点图的命令:GSCATTER(X,Y,G) creates a scatter plot of the vectors X and Y<BR> grouped by G. Points with the same value of G are shown with<BR> the same color and marker. G is a grouping variable defined as<BR> a vector, a cell array of strings, or a string matrix, and it<BR> must have the same number of rows as X and Y. Alternatively<BR> G can be a cell array of grouping variables (such as {G1 G2 G3})<BR> to group the values in X by each unique combination of grouping<BR> variable values.<BR>我要画散点图,现在有x,y的两组数据,但是这个G怎么给呢?请指教!