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Piecewise function with input as coordinate (x,y) of curve's points
the actual piecewise function in OPL takes as input abscissas and vector coefficient to construct the function. Many time people have user have the (x;y) coordinate. to do that you need to write OPL code to find the vector coefficient. Would be great to have a second piecewise function that takes the (x,y) coordicnate directly.
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