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

[Carl Witthoft]

No, the point of my question is how to plot the Re and Im parts as two 
separate surfaces in one chart.

On 10/14/11 5:46 AM, Eik Vettorazzi wrote:
> 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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