fd1d - Robuta Search

https://people.sc.fsu.edu/~jburkardt/octave_src/fd1d_heat_explicit_test/fd1d_heat_explicit_test.html fd1d_heat_explicit_test heat explicit test https://people.sc.fsu.edu/~jburkardt/f_src/fd1d_wave/fd1d_wave.html fd1d_wave wave