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Parametric equations

 
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Paul Dennis



Joined: 08 Oct 2015
Posts: 1
Location: Norwich

PostPosted: Thu Oct 08, 2015 3:59 am    Post subject: Parametric equations Reply with quote

Is there a straightforward way in DataGraph to plot the output of a parametric equation. I would like to plot confidence ellipses for data where there is a strong covariance. Basically I can determine the eigen vectors and values from the covariance matrix. I can translate these into a parametric equation for the error ellipse but canít find a way to plot this function in DataGraph.

I think such an ability would be very useful for many of us.

I would be grateful for any tips, advice, or help.
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David
Site Admin


Joined: 25 Nov 2006
Posts: 1938
Location: Chapel Hill, NC

PostPosted: Sun Oct 11, 2015 5:03 pm    Post subject: Reply with quote

Can you e-mail me some examples? I added a Region command recently and there the question was what do with ellipses where the major/minor axis are not along the x/y axis. The issue was what I should do to specify the axis (in your case eigenvectors). I am interested in understanding better what your underlying data is, and if this is a something where you can use a small number of drawing commands or need to scale this up to a large number of points.


David
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