[R-SIG-Finance] layout options of barChart in quantmod

[Jeff Ryan]

This should clarify (from a previous off-list exchange):

Before calling any chartSeries function (including barChart), use the
R 'layout' function. see ?layout
Each window is technically a plot region, so count the TA _windows_ when
you do this.

getSymbols("SPY;DIA;QQQQ;IWM")
layout(matrix(1:8, nrow=4), height=c(4,2.5,4,2.5))

Then set layout=NULL in each call.
chartSeries(IWM, layout=NULL)
chartSeries(SPY, layout=NULL)
chartSeries(DIA, layout=NULL)
chartSeries(QQQQ, layout=NULL)

You need to have a constant 'theme', or funny things will happen.


Other arrangements are possible, though require you to really get your
head around 'layout'.  I will one day be adding in a chartLayout tool
that will make this easier, but for now it is at least doable.

layout(matrix(c(1,1,1,2,3:6), nrow=4), height=c(4,2.5,4,2.5))
chartSeries(QQQQ, layout=NULL)
chartSeries(QQQQ, layout=NULL)
chartSeries(QQQQ, layout=NULL)

You won't be able to use this interactively once the chart is drawn
--- i.e. calling addTA to dynamically add TA additions.  The layout
needs to be calculated before any of the drawing takes place.  This is
what happens internally when you call addTA/chartSeries,, which is why
setting layout=NULL places the burden on you the user.

HTH,
Jeff

On Thu, Nov 13, 2008 at 8:11 AM, 风 <windspeedo at qq.com> wrote:
> quantmod is a fantastic tool for R.  The only problem I could not overcome is about the layout option in barChart.
> The help document only said that "layout:  if NULL bypass internal layout  ".
> But how could I produce the chart as shown in http://www.quantmod.com/gallery/ ?
> What value should I set the layout to obey the previous layout settings in R?
> Thanks.
>
> Wind
>
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-- 
Jeffrey Ryan
jeffrey.ryan at insightalgo.com

ia: insight algorithmics
www.insightalgo.com