Hello,
So I have to spline some data I acquired with ginput. While using spline, I get the following error
Error using chckxy
The first input must contain unique values.
At first I thought I had accidently selected two or more equal points, so I tried selecting random points which I knew were different for sure, and I still get the same error.
Then, I get another error in
spline
itself:
[x,y,sizey,endslopes] = chckxy(x,y);
Keep in mind this is not even part of my code, this is just matlab's function.
The code I use to acquire the points is this one:
- mov = VideoReader('pendulo.mp4'); % estrutura com video
- nFrames = mov.NumFrames; % numero de frames
- framerate = mov.FrameRate; % numero de frames por segundo
- dtframes=1/framerate; %tempo entre frames
- i=1; t=0; tf=nFrames*dtframes; dt=10*dtframes;
- if ~exist('dados.mat','file')
- while (t <= tf)
- mov.CurrentTime=t; frame=readFrame(mov); image(frame); drawnow
- tv(i)=t; t=t+dt; i=i+1; title(strcat('Frame ',num2str(i)));
- [x(i) ,y(i)]=ginput(1);
- end
- save ('dados.mat', 'x', 'y');
- load ('dados.mat', 'x', 'y');
- end
and the code I use for the spline function is this one:
- load ('dados.mat', 'x', 'y');
- xx = linspace(0,500,100);
- yy = spline(x,y,xx);
- figure;
- plot(x, y, 'ro');
- hold on;
- plot(xx, yy, 'b', 'LineWidth', 1.5);
I don't understand why I get an error at MATLAB's own function, and why I get the "must contain unique values" error, even though they
are
unique.
The data is annexed as 'dados.mat'.
