MATLAB: Points of CSCVN function

calculate pointscscvncurve fittinginterpolationMATLAB

Hi! I use the cscvn function to make a path. I need to get the interpolated points ( I mean the points what the cscvn calculates to plot the curve ) to make a curvature diagram, but i can only see a struct with coefs. How can I calculate the points of the curve? (The "plot it and get the plot data" solution is not suitable for my task) Thank You!

Best Answer

Hi! I solved my problem, so i write the solution down, if sb needs it.. So, at first, I cuted the spline to pieces, with the fnbrk function, and after that I evaluated these pieces with the fnval(j-th piece,j-th break range) function. Good luck!

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MATLAB: Error in using fmincon to minimization

Your objective should be implemented as follows

function f=wartoscminimalna(x,coeff123)
x1=x(1);
x2=x(2);
x3=x(3);
f=-(coef123(1)+coef123(2)*x1+coef123(3)*x2+coef123(4)*x3+coef123(5)*x1.*x2+coef123(6)*x1.*x3+coef123(7)*x2.*x3+coef123(8)*x1.^2+coef123(9)*x2.^2+coef123(10)*x3.^2);

and then

 [x,fval]=fmincon(@(x)wartoscminimalna(x,stats123.beta),xstart,...
                   [],[],[],[],[-1,-1,-1],[1,1,1]);

MATLAB: How to extract points from a curve

Matlab Code

npts = 3;

xy = [randn(1,npts); randn(1,npts)];

%plot(xy(1,:),xy(2,:),'ro','LineWidth',2);

%text(xy(1,:), xy(2,:),[repmat(' ',npts,1), num2str((1:npts)')])

ax = gca;

ax.XTick = [];

ax.YTick = [];

hold on

fnplt(cscvn(xy),'r',2);

hold off

cscvn(xy)

This is the matlab code and the idea that I need to extract n points from cscvn(xy)

When I see cscvn(xy) . This curve is a structure not a set of points.

What I need is to extract data points from this curve

Thank you

Best Answer

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MATLAB: Error in using fmincon to minimization

MATLAB: How to extract points from a curve

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