R help - Jun 2011 - 3D-plotting a 2D-matrix that contains z-values (3rd dimension)

Hello,

say I have a 2D-matrix (indexed by x and y), which contains
z values, which I want to plot over x-y.

Either dotted, or if possible as a landscape.

I tried around with persp and plot3d (from rgl)
and persp3d (from rgl).

I sometimes get something that looks good and a while later, when
trying some new data I need to worry about that again.

Is there something lika a convenience function that
can be used to feed the data into persp, rgl::plot3d and rgl::persp3d?

At least persp3d is picky about the order of the input data,
and I somehow always start again.

(plot3d seems to be most mathcing how I think).

Isn't that a very common case, where  my  z_x_y = mydata[x,y] ?

Maybe I just don't know the right function that helps me.

Any idea about that?


Ciao,
   Oliver

Well,

persp(x, y, z) does exactly what you asked for: it plots tha matrix z 
along the values given by the vectors x and y.
If you need to calculate z values from x and y using some function foo, 
outer(x, y, foo) is typically your friend.

Uwe Ligges





On 08.06.2011 16:57, Oliver wrote:
> Hello,
>
> say I have a 2D-matrix (indexed by x and y), which contains
> z values, which I want to plot over x-y.
>
> Either dotted, or if possible as a landscape.
>
> I tried around with persp and plot3d (from rgl)
> and persp3d (from rgl).
>
> I sometimes get something that looks good and a while later, when
> trying some new data I need to worry about that again.
>
> Is there something lika a convenience function that
> can be used to feed the data into persp, rgl::plot3d and rgl::persp3d?
>
> At least persp3d is picky about the order of the input data,
> and I somehow always start again.
>
> (plot3d seems to be most mathcing how I think).
>
> Isn't that a very common case, where  my  z_x_y = mydata[x,y] ?
>
> Maybe I just don't know the right function that helps me.
>
> Any idea about that?
>
>
> Ciao,
>     Oliver
>
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