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This is the fastest (though not most accurate) method of fitting a circlle to data points on a plane (given by their xy-coordinates). It returns the circle center (a,b) and radius R. It was proposed by I. Kasa in article "A curve fitting procedure and its error analysis", IEEE Trans. Inst. Meas., Vol. 25, pages 8-14, (1976). Another version of this circle fit has been posted by Izhak Bucher (file 5557).



Plots triples ( t, real(z(t)), imag(z(t)) ), a shiskebob of complex numbers. For visual context, each complex number is a dot on its own gray constant-amplitude envelope circle with a blue radius from the center axis.



Accepts a list of x and y coordinates. First, we find the smallest circumscribing polygon from this list (convhull). Finally, we use this polygon's coordinates to find the smallest circumscribing circle. We find the circle by minimizing the...



[center,rad,v1,v2] = circlefit3d(p1,p2,p3)

This function computes centers and radii of circles, that interpolate some given triples of points in 3d space.

The function accepts the input of matrices of trial points also,...



This is a robust and accurate circle fit. It works well even if data
points are observed only within a small arc. This circle fit was
proposed by G. Taubin in article "Estimation Of Planar Curves, Surfaces And Nonplanar Space Curves...



This is a robust and accurate circle fit. It works well even if data
points are observed only within a small arc. This circle fit was proposed by V. Pratt in article "Direct least-squares fitting of algebraic surfaces", Computer...



Crop upper/lower half-, and whole-circle sections in the center of a colour image. Optional move of cropped section inside the image and away from center.



This function uses rectangle command to plot a circle. The center is to be given in a vector form and radius is a non-negative number.



CHT to detect circle with limits on R and making sure the center of the circle is within the circle.



Function used to compute the center of the circle given two points and a radius. Takes only real inputs and gives only real outputs. Make sure the units are consistent

%Inputs:
%P1-First point e.g. [3 4] => (x1,y1)
...



Take a center point, a normal vector and a radius and plots a Circle in 3D using plot3



Can you find the white circle with a black dot in its center



This routine draws a circle with center defined as a vector CENTER, radius as a scaler RADIS. NOP is the number of points on the circle.



This code takes an input of a set of given (x,y) points in the Cartesian coordinates and returns the center and radius of the minimum circle enclosing the points.

This code is based on that of Yazan Ahed, and contains no changes in the...



Iterative, robust fit of the exact equation of a circle to xy data. Outliers are identified based on multiples of current standard deviation and "set aside". The interative solution proceeds until there are no remaining outliers. Returns...



Arbitrary-order polynomial datum is fit to and extracted from input xy data. Outliers - defined based either on a non-parametric or mutliples-of-standard deviation criteria - are optionally identified and "set aside". The interative...



GCIRCLE(FIG) draws a circle by clicking the mouse at the center and at some distance away in the figure FIG.

H = GCIRCLE(FIG) Returns the handle to the line.

GCIRCLE with no input arguments draws in the current figure.



Fits an ellipsoid into a 3D set of points, allows some constraints, like orientation constraint and equal radii constraint. E.g., you can use it to fit a rugby ball, or a sphere. 'help ellipsoid_fit' says it all. Returns both the algebraic...



This function create a matrix containing a filled circle. The circle has center in points specified in vector vCenter (represented as [x y]) and radius specified by nRadius.



FILLEDCIRCLE Filled circle drawing

filledCircle(CENTER,R,N,COLOR) draws a circle filled with COLOR that has CENTER as its center and R as its radius, by using N points on the periphery.

Usage Examples,