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    • Morten Welinder's avatar
      expr-deriv: new code for analytic derivative of spreadsheet expressions. · b444765b
      Morten Welinder authored
      This can generate some fairly impressive expressions for the derivative
      of the function that an expression represents.
      
      It is not particularly smart: it understands constants, +, -, *, /, ^,
      and the functions sum and sumsq.  For anything else, it bails.  In case
      you are wondering, those elements are enough to compute the square
      residuals of rational models.
      b444765b
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