Re: [R] passing arguments to FUN in lapply

From: Uwe Ligges <ligges_at_statistik.uni-dortmund.de>
Date: Fri 18 Mar 2005 - 22:46:23 EST

Pingping Zheng wrote:

> Suppose I have a nx2 matrix of data, X, the following code generate
> density estimation for each column and plot them
>
> denlist <- apply(X, 2, density)
> par(mfrow=c(1,2))
> lapply(denlist, plot)
>
> Does anyone know how to change the main title of each density plot
> to "var 1", "var 2" by passing optional argument "main"? I've tried
>
> lapply(denlist, plot, main=c("var 1", "var 2"))
> which generates two same titles "var 1/var 2" and "var 1/var 2"
>
> lapply(denlist, plot, main=list("var 1", "var 2"))
> which generates two same titles "var 1"
>
> Both are not I want.
>

If the title is contained in denlist, you can specify a anonymous function, if not, use mapply or simply a for() loop.

Uwe Ligges



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