Vectorcardiogram (VCG) Animation Color Speed

This demo shows an animated plot of vectorcardiogram signals

% This demo shows an animated plot of vectorcardiogram signals. The color values are associated
% with the moving speed of VCG vectors.
% If you find this demo useful, please cite the following paper:
% [1] H. Yang, S. T. S. Bukkapatnam, and R. Komanduri, “Spatiotemporal Representation of
% Cardiac Vectorcardiogram (VCG) Signal,” Biomedical Engineering Online, Vol.11, No. 16,
% 2012, DOI: 10.1186/1475-925X-11-16
% [2] H. Yang, S. T. S. Bukkapatnam, L. Trung and R. Komanduri, “Identification of
% myocardial infarction (MI) using spatio-temporal heart dynamics,” Medical Engineering and Physics,
% Vol. 34, No. 4, p485-497, 2011, DOI: 10.1016/j.medengphy.2011.08.009