R help - Sep 2009 - turning a list into a function's params

Apologies for the noob question. I need to split setting up a plot and drawing
it into two functions. One determines the properties of a plot (data, axis,
labels, etc.), and the other plots it (using a preferred device, image
dimensions, etc.).

get.props = function() {
  list(x=x, y=y, xlab="foo", ylab="bar")
}

myplot = function() {
  props = get.props()
  plot(props) # Doesn't work
}

What's the right way to call plot() with all the components of props broken
out
as separate parameters to plot()? Note that the components of props may be
different from call to call (sometimes there's only x data, sometimes
there's no
ylab, etc.).

Thanks in advance for your time and help.

On 14/09/2009, at 2:34 PM, Jack Tanner wrote:
> Apologies for the noob question. I need to split setting up a plot  
> and drawing
> it into two functions. One determines the properties of a plot  
> (data, axis,
> labels, etc.), and the other plots it (using a preferred device, image
> dimensions, etc.).
>
> get.props = function() {
>   list(x=x, y=y, xlab="foo", ylab="bar")
> }
>
> myplot = function() {
>   props = get.props()
>   plot(props) # Doesn't work
> }
>
> What's the right way to call plot() with all the components of  
> props broken out
> as separate parameters to plot()? Note that the components of props  
> may be
> different from call to call (sometimes there's only x data,  
> sometimes there's no
> ylab, etc.).
>
> Thanks in advance for your time and help.
do.call(plot,props)

See ?do.call .

	cheers,

		Rolf Turner

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