使用pcolor可以画二维矩阵的伪彩色图，如下是画二维圆形云图的代码：
r = linspace(0, 1, 100)';t = linspace(0, 2*pi, 100);X = r*cos(t);Y = r*sin(t);C = 2 - X.^2 - Y.^2;p = pcolor(X, Y, C);set(p,'LineStyle','none');axis equalcolormap jet
