[R] how to plot two surfaces with lattice::wireframe

[Eik Vettorazzi]

Hi Carl,
I have no idea what z or f(z) are, but maybe outer will help you:

wireframe(outer(seq(0,5,length.out=50),seq(2,4,length.out=40),function(x,y)sin(x*y)))

cheers.

Am 13.10.2011 23:37, schrieb Carl Witthoft:
> Hi all,
> I'd like to plot the Real and Imaginary parts of some f(z) as two
> different surfaces in wireframe (the row/column axes are the real and
> imag axes).  I know I can do it by, roughly speaking, something like
> 
> plotz <- expand.grid(x={range of Re(z)}, y={range of Im(z), groups=1:2)
> plotz$func<-c(Re(f(z),Im(f(z))
> wireframe(func~x*y,data=plotz,groups=groups)
> 
> But that seems like a clunky way to go, especially if I happen to have
> started out with a nice matrix of the f(z) values.
> 
> So, is there some simpler way to write the formula in wireframe?  I
> envision, for a matrix of complex values zmat,  pseudocode:
> 
> wireframe(c(Re(zmat),Im(zmat), groups=1:2)
> 
>  -- and yes, I'm fully aware that without a connection between the
> 'groups' variable and zmat, this won't work as written.
> 
> All suggestions (including "read the help file for {some lattice func I
> didn't know about} ) greatfully accepted.
> 
> Carl


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Eik Vettorazzi
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Universitätsklinikum Hamburg-Eppendorf

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