A simple approach is to swap x and y and rotate the theta parameter -90 degrees (play around with this until it is what you want).
Hope this helps, -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare [EMAIL PROTECTED] (801) 408-8111 > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of James > Sent: Tuesday, October 30, 2007 8:17 PM > To: r-help@r-project.org > Subject: [R] reversing perspective plot axis > > Hi, > > I am trying to create a perspective plot with Time on the > x-axis, Underlying Price on the y-axis, and Option Price on > the z-axis. But I don't like the way my x-axis is setup. > Right now, Time is this sequence. > > Time = seq(from = 1/52, to = 1, by=1/52) > > That results in the x-axis going from 0 at the back, to 1 > near the foreground corner.(If that makes any sense) I want > to do the exact opposite. When I try this sequence: > > Time = seq(from = 1, to = 1/52, by=-1/52) > > I get this error message: > > Error in persp.default(x = Time, y = S, z = Price, xlab = > "Time", ylab = "S", : > increasing 'x' and 'y' values expected > > So it seems that I can't use a descending sequence for my > perspective plot. Is that true? Is there a way to work around this? > > persp(x=Time, y=S, z=Price, xlab="Time", ylab="S", zlab=TypeFlag, ...) > > Essentially, what I'm trying to create is something that > looks like this. > > http://www.insightful.com/products/finmetrics/opSensitivity1_lg.gif > > You can see how Time on the x-axis diminishes as it moves to > the foreground corner. > > Thanks in advance. > > James > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
