I'm using contour() to draw streamlines of potential flow, eg
jj <- seq(from= -4, to=4,len=20)
jj <- outer(jj,jj,function(x,y){x})+1i*outer(jj,jj,function(x,y){y}) f <- function(x){x^2}
contour(Im(f(jj)), nlevels=44 , labels="")How best to put arrows on the contour lines to show the direction of flow? (ie I want contour lines looking like ---<--- and ---->----)
I think this is a lot of work, which I don't mind doing, but it'd be good to hear the list's ideas before starting to bark up the wrong tree, so to speak.
-- Robin Hankin Uncertainty Analyst Southampton Oceanography Centre SO14 3ZH tel +44(0)23-8059-7743 [EMAIL PROTECTED] (edit in obvious way; spam precaution)
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