R/quantmod: multiple charts all using the same y-axis

Question

I\'m trying to plot 6 days of intraday data as 6 charts. Quantmod\'s experimental chart_Series() function works with par() settings. I\'ve pre-loaded the data into bar

Answer 1

With chartSeries, you can set the layout argument to NULL to prevent the layout() command from being called: this is what disables the mfrow setting.

library(quantmod)
getSymbols("AA")

op <- par(mfrow=c(3,2))
for(i in 1:6) {
  chartSeries(
    AA["2011-01"], "candlesticks", 
    TA=NULL, # No volume plot
    layout=NULL, 
    yrange=c(15,18)
  )
}
par(op)

If you want to keep the volume, you can call layout instead of setting mfrow: it does basically the same thing, but allows you to have plots of different sizes and choose the order in which they are plotted.

layout( matrix( c(
    1, 3,
    2, 4,
    5, 7,
    6, 8,
    9, 11,
   10, 12
  ), nc=2, byrow=TRUE),
  heights = rep( c(2,1), 3 )
)
#layout.show(12) # To check that the order is as desired
for(i in 1:6) {
  chartSeries( 
    AA[sprintf("2011-%02d",i)], 
    "candlesticks", layout=NULL, yrange=c(15,19) 
  )
}

Answer 2

Googling to understand Vincent's answer led me to the layout() command. It seems incompatible with par(mfrow), but some more experimentation found it can be used as an alternative.

ylim=c(18000,20000)
layout(matrix(1:12,nrow=6,ncol=2), height=c(4,2,4,2,4,2))
for(d in bars){
    chartSeries(d,layout=NULL,TA=c(addVo(),addBBands()),yrange=ylim)
    }

(You'll notice I added bollinger bands too, to be sure overlays still work too.)