pwl_aprox_1d_test, a FORTRAN77 code which defines and evaluates a piecewise linear function, using NC "control points", which approximates a set of ND data points (x(i),y(i)).
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pwl_approx_1d, a FORTRAN77 code which defines and evaluates a piecewise linear function, using NC "control points", which approximates a set of ND data points (x(i),y(i)).