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interparc 1.0

  Date Added: April 01, 2013  |  Visits: 187

interparc

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A common request is to interpolate a set of points at fixed distances along some curve in space (2 or more dimensions.) The user typically has a set of points along a curve, some of which are closely spaced, others not so close, and they wish to create a new set which is uniformly spaced along the same curve.When the interpolation is assumed to be piecewise linear, this is easy. However, if the curve is to be a spline, perhaps interpolated as a function of chordal arclength between the points, this gets a bit more difficult. A nice trick is to formulate the problem in terms of differential equations that describe the path along the curve. Then the interpolation can be done using an ODE solver.As an example of use, I'll pick a random set of points around a circle in the plane, then generate a new set of points that are equally spaced in terms of arc length along the curve, so around the perimeter of the circle.theta = sort(rand(15,1))*2*pi;theta(end+1) = theta(1);px = cos(theta);py = sin(theta); 100 equally spaced points, using a spline interpolant.pt = interparc(100,px,py,'spline');% Plot the resultplot(px,py,'r*',pt(:,1),pt(:,2),'b-o')axis([-1.1 1.1 -1.1 1.1])axis equalgrid onxlabel Xylabel Ytitle 'Points in blue are uniform in arclength around the circle'

Requirements: No special requirements
Platforms: Matlab
Keyword: Circle Differential Equally Generate Length Perimeter Plane Random
Users rating: 0/10

License: Shareware Size: 10 KB
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