c=least_absolute(Signal, Error, Model) weighted least absolute criteria the return value is a vector, and most optimizers use its sum (except LM). |Signal-Model|/Error A good fit corresponds with a criteria lower or equal to 1. <http://en.wikipedia.org/wiki/Least_absolute_deviation> (c) E.Farhi, ILL. License: EUPL.

- least_max c=least_max(Signal, Error, Model)
- least_mean c=least_mean(Signal, Error, Model)
- least_median c=least_median(Signal, Error, Model)
- least_square c=least_square(Signal, Error, Model)

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