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使用Calc做微积分

 3 years ago
source link: https://www.lujun9972.win/blog/2019/08/31/%E4%BD%BF%E7%94%A8calc%E5%81%9A%E5%BE%AE%E7%A7%AF%E5%88%86/index.html
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使用Calc做微积分

Calc居然还能计算微积分!不亏为穷人的matlab啊。

  1. 输入方程式，比如 1/x+x^2+1
  2. 根据minibuffer中的提示，输入微分变量，比如 x
  3. 得到结果 2x-x^-2

calc-deriv-1.png

  1. 输入方程式，比如 sin(x)+x
  2. 根据minibuffer中的提示，输入积分变量，比如 x

  3. 得到结果 x^2 / 2 - 180 cos(x) / pi

    calc-integ-1.png

在Org-babel中使用Calc进行微积分

deriv(1/x+x^2+1,x)

2 x - x^-2

计算在某一点上的微分值 

deriv(1/x+x^2+1,x,1)

integ(sin(x)+x,x)

x^2 / 2 - 180 cos(x) / pi

计算某一点上的积分值 

integ(sin(x)+x,x,90)

4050

report

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