Thank you everyone who contacted me so quickly!

I am posting the solution here, so that it is in the archive:

> plot(x.irf , plot.type="multiple" , names="p.ret")
> plot(x.irf , plot.type="multiple" , names="n.ret")


The returns() function in is the timeSeries package. However, one can replace the "na.omit(returns(x[,2]))" bits below with any two vectors of data.

C.Evans

On 30 Nov 2010, at 9:22 AM, Charles Evans wrote:

After searching multiple combinations of keywords over the past two days and downloading n R graphics tutorials, I have not been able to find anything online or in my R books about how to save multiple plot panes to PNG.

Specifically, I am using the irf() function in the vars package to generate plots of Impulse Response Functions:

> x.data <- cbind(na.omit(returns(p[,2])),na.omit(returns(n[,2])))
> colnames(x.data) <- c("p.ret","n.ret")
> x.jo <- ca.jo(x.data,type="trace",ecdet="none",spec="transitory")
> x.var <- vec2var(x.jo)
> x.irf <- irf(x.var,n.ahead=30)
> plot(x.irf)

This results in a plot containing a pair of IRF graphs in Quartz and the following message in the Console:

"Hit <Return> to see next plot:"

When one hits <Return>, the next pair of IRF graphs appears in Quartz.

When I try to save the plots to PNG

> png(...)
> plot(...)
> dev.off()

I am able to save only one of the plots. How does one tell plot() to plot first one of the panes and then the second?

Any help would be greatly appreciated.

Yours,

Charles Evans

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