Illustrating lecture notes with TikZ, I needed to draw a curve fulfilling certain conditions. Had to come up with an equation - then change parameters manually until it looked ok - kind of.

Is there no tool for this? Draw a curve (with mouse, tablet or fingers), then let the computer find one or more equations that fit it reasonably, e.g. by genetic algorithm. There is literature about it - but no implementation or app?

Could this be an idea for a start-up? Who wants something like that, too?

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