r - R中的灰度堆叠区域图

我正在使用plotrix软件包中的stackpoly()命令在R中绘制堆积面积图。至少可以说，默认颜色是刺眼的。有没有办法使用符号或灰度？

最佳答案

来自?stackpoly：

 col: Color to fill the polygons. If NULL, ‘rainbow’ will be called
      to generate the colors. If NA, the polygons will not be
      filled.

稍微修改?stackpoly中的示例：

stackpoly(matrix(cumsum(testx),nrow=10),main="Test Stackpoly I",
   xaxlab=c("One","Two","Three","Four","Five","Six","Seven","Eight","Nine","Ten"),
  border="black",staxx=TRUE,
col=gray(seq(0.1,0.9,length=10)))