Remez (exchange) algorithm.

Only six functions are available now.
Write the parameters: a and b, the interval endpoints; the degree of the approximation; and the number N of gridpoints, in the white subwindows. Then, click on one of the six functions buttons. You should see the error function corresponding to a first set of trial extremal points (blue lines). The true extremum [on the set of grid points] is shown by a red line. By pushing several times on the "Next" button, further steps of the exchange algorithm are shown.
Whenever you change a parameter, push again on a function button before using the "Next" button.

Alphonse Magnus, February 2000.

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The source file