gvisCandlestickChart: Google Candlestick chart with R

Description

An interactive candlestick chart. The gvisCandlestickChart function reads a data.frame and creates text output referring to the Google Visualisation API which can be included into a web page, or as a stand-alone page. The actual chart is rendered by the web browser using SVG or VML.

Usage

gvisCandlestickChart(data, xvar = "", low = "", open = "",
                           close = "", high = "",
                           options = list(), chartid)

Arguments

data

a data.frame to be displayed as a candlestick chart. The data has to have at least 5 columns.

xvar

name of the character column which contains the category labels for the x-axes.

low

name of the numeric column specifying the low/minimum value of this marker. This is the base of the candle's center line.

open

name of the numeric column specifying the opening/initial value of this marker. This is one vertical border of the candle. If less than the close value, the candle will be filled; otherwise it will be hollow.

name of the numeric column specifying the closing/final value of this marker. This is the second vertical border of the candle. If less than the open value, the candle will be hollow; otherwise it will be filled.

high

name of the numeric column specifying the high/maximum value of this marker. This is the top of the candle's center line.

options

list of configuration options for Google Combo Chart. The possible components are, taken from http://code.google.com/apis/visualization/documentation/gallery/candlestickchart.html#Configuration_Options: [object Object],[object Objec

chartid

character. If missing (default) a random chart id will be generated based on chart type and tempfile

Value

gvisCandlestickChart returns list of class "gvis" and "list". An object of class "gvis" is a list containing at least the following components:
typeGoogle visualisation type, here 'CandlestickChart'
chartidcharacter id of the chart object. Unique chart ids are required to place several charts on the same page.
htmla list with the building blocks for a page [object Object],[object Object],[object Object],[object Object]

Details

From http://code.google.com/apis/chart/interactive/docs/gallery/candlestickchart.html#Overview: A candlestick chart is used to show an opening and closing value overlaid on top of a total variance. Candlestick charts are often used to show stock value behavior. In this chart, items where the opening value is less than the closing value (a gain) are drawn as filled boxes, and items where the opening value is more than the closing value (a loss) are drawn as hollow boxes.

References

Google Candlestick Chart API: http://code.google.com/apis/chart/interactive/docs/gallery/candlestickchart.html

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Examples

Run this code

## Please note that by default the googleVis plot command
## will open a browser window and requires an internet
## connection to display the visualisation.

## Example data set
OpenClose

C1 <- gvisCandlestickChart(OpenClose, xvar="Weekday", low="Low",
                                      open="Open", close="Close",
                                      high="High",
                                      options=list(legend='none'))

plot(C1)

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