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From andrea antonello <>
Subject Re: [math] solving bivariate quadratic equations
Date Fri, 06 Dec 2013 09:02:53 GMT
Hi Ted,
thanks for the reply.

> How would you like to handle the fact that you may have an infinite number
> of solutions?  Will you be happy with any of them?  Or do you somehow want
> to find all of them?

I am afraid my math knowledge goes only to a certain point here (too
few it seems).
In my usecase I am trying to define a terrain model from sparse points
(lidar elevation points).
So my idea was to get a set of points (given X, Y, Z) to define the
parameters of the equation and then be able to calculate an elevation
(Z) for any position I need interpolated.

I would then expect to have an exact value once the parameters are defined.

I am not sure how to find the parameters though...


> On Thu, Dec 5, 2013 at 5:31 AM, andrea antonello <
>> wrote:
>> Hi, I need a hint about how to solve an equation of the type:
>> Z = aX^2 + bY^2 + cXY + dX + eY + f
>> Is an example that handles such a case available? A testcase code maybe?
>> Thanks for any hint,
>> Andrea
>> PS: is there a way to search the mailinglist for topics? I wasn't able
>> to check if this had already been asked.
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