R: Add a polygon to an existing xts plot

addPolygon {xts} | R Documentation

## Add a polygon to an existing xts plot

### Description

Draw a polygon on an existing xts plot by specifying a time series of y coordinates. The xts index is used for the x coordinates and the first two columns are the upper and lower y coordinates, respectively.

### Usage

    addPolygon(x, y = NULL, main = "", on = NA, col = NULL, ...)

### Arguments

`x` | an xts object to plot. Must contain 2 columns for the upper and lower y coordinates for the polygon. The first column is interpreted as the upper y coordinates and the second column as the lower y coordinates.
`y` | NULL, not used
`main` | main title for a new panel if drawn.
`on` | panel number to draw on. A new panel will be drawn if `on=NA`.
`col` | color palette to use, set by default to rational choices.
`...` | passthru parameters to `par`

### Author(s)

Ross Bennett

### References

Based on code by Dirk Eddelbuettel from http://dirk.eddelbuettel.com/blog/2011/01/16/

[Package xts version 0.10-1 Index]