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3d polar

Sun, 06/27/2010 - 11:05 pm

I have a txt file containing the columns "r", "phi", and "z". Actually I'd like to plot something like a 3d polar plot or a surface working with the polar coordinates. Does anyone know how to handle these datasets? I know how to import the file into three different waves but I cannot plot them in a useful way. All the graphit I did before was 2D.

Thanks in advance
Andreas

Igor

Hello Andreas,

The approach you choose depends on the shape of the surface. If your surfaces can be expressed as z=F(r,phi) you could simply convert the set of {r_i,phi_i} to {x_i,y_i} and then proceed to build a full surface on a rectangular grid using ImageInterpolate with the keyword Voronoi. This process is demonstrated in the surface from scatter video tutorial here: http://www.wavemetrics.net/tutorials/gizmo/

If the surface is parametric (i.e., more than 1 z value for each {r_i,phi_i}, you can convert the data to Cartesian coordinates and create a parametric wave representation with a 3-layer 3D wave where the first layer corresponds to the x-component, the second to y and the third to z. You then create a surface object in Gizmo using the parametric wave.

If you are not sure how to handle this, feel free to send me a copy of your experiment and I will help you with it.

A.G.
WaveMetrics, Inc.

June 28, 2010 at 09:37 am - Permalink