[R] plotting functions with line width (lwd) as vectors

[Wolfram Fischer - Z/I/M]

If I want to plot different widths of line segments or arrows
I have to program loops to plot each line apartly. Is that
right?
	n    <- 6
	x    <- 1:n
	y    <- rnorm(1:n)
	q    <- ( x %% 3 + 1 ) * 2
	plot( x, y, cex=q )
	for( i in 1:(n-1) ) lines( x[i:(i+1)], y[i:(i+1)], lwd=q[i], col=q[i] )

Would it not be possible to make plotting functions accept
vectors of line widths (as they accept vectors of colors
and vectors for cex)?

So you could say e.g.:
	plot( x, y, cex=q )
	lines( x, y, lwd=q, col=q )

Wolfram
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