[R] reversing perspective plot axis
Greg.Snow at intermountainmail.org
Wed Oct 31 16:48:26 CET 2007
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
greg.snow at intermountainmail.org
> -----Original Message-----
> From: r-help-bounces at r-project.org
> [mailto:r-help-bounces at r-project.org] On Behalf Of James
> Sent: Tuesday, October 30, 2007 8:17 PM
> To: r-help at r-project.org
> Subject: [R] reversing perspective plot axis
> 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.
> You can see how Time on the x-axis diminishes as it moves to
> the foreground corner.
> Thanks in advance.
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