[R] reversing perspective plot axis

Greg Snow 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
Intermountain Healthcare
greg.snow at intermountainmail.org
(801) 408-8111

> -----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
>
> 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.
>
>
> James
>
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