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Сергей Александров
Asked:2020-11-05 21:01:22 +0000 UTC2020-11-05 21:01:22 +0000 UTC

符号计算（简化数学表达式）

  • 772

有这样一个例子：

0.88522+(x-0.2)*0.9823456+(x-0.235)(x-0.2145)*(-0.976123)

您需要将其转换为以下形式（结果来自Wolfram Mathematica）：

0.639547 + 1.42111 x - 0.976123 x^2

这如何实施python？

python

1 个回答

  1. Best Answer

    使用Sympy模块：

    from sympy import simplify

from sympy.parsing.sympy_parser import (
        parse_expr,
        standard_transformations,
        implicit_application,
        implicit_multiplication,
        implicit_multiplication_application,
        function_exponentiation)

transformations=(standard_transformations +
                 (implicit_multiplication,
                  implicit_application,
                  function_exponentiation,
                  ))

formula = "0.88522+(x-0.2)0.9823456+(x-0.235)(x-0.2145)(-0.976123)"
expr = parse_expr(formula,transformations=transformations)
simplified_formula = simplify(expr)
print(simplified_formula)

    结果：

    -0.976123*x**2 + 1.4211128885*x + 0.6395469598775

    P.S. Sympy安装

    • 4

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