Correction on Bezier extraction of TSplines

An Algorithm for Bezier extraction of TSplines was introduced in "Isogeometric finite element data structures based on Bezier extraction of T-Splines", by M. A. Scott, M. J. Borden, C. V. Verhoosel, T. W. Sederberg, and T. J. R. Hughes, in International Journal for Numerical Methods in Engineering 2011, DOI: 10.1002/nme.3167.

However, during our own testing we noticed minor errors. They have been corrected in this Matlab application. We further give a simple framework to further understand the principles of Bezier extraction of 1D TSplines, i.e. BSplines, based on the works of the aforementioned paper.