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Lecture 33a, Lagrange fit triangles

Phi functions for triangles.
Using basic Lagrange polynomials to get a value 1.0 at
the vertex of interest and a value of 0.0 at the other
two vertices.

A "C" implementation is shown by:

phi_tril.c
phi_tril.h

A Matlab implementation with resulting plots is:

phi_tril.m

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Other links

• CMSC 455 home page
• Syllabus - class dates and subjects, homework dates, reading assignments
• Homework assignments - the details
• Projects -
• Partial Lecture Notes, one per WEB page
• Partial Lecture Notes, one big page for printing
• Downloadable samples, source and executables
• Some brief notes on Matlab
• Some brief notes on Python
• Some brief notes on Fortran 95
• Some brief notes on Ada 95
• An Ada math library (gnatmath95)
• Finite difference approximations for derivatives
• Reference pages on Taylor series, identities,
  coordinate systems, differential operators

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