Python-sympy科学计算与数据处理(方程，微分，微分方程，积分)

阳光穿透心脏的1/2处 2021-11-29 08:56 302阅读 0赞

**方程**

**![1322499-20190713144608421-340230861.png][]**

![1322499-20190713144631831-856426723.png][]

a,b,c,x = symbols("a b c x")
    my_eq = Eq(a*x**2+b*x+c,0)
    solve(my_eq,x)
    Out[12]: [(-b + sqrt(-4*a*c + b**2))/(2*a), -(b + sqrt(-4*a*c + b**2))/(2*a)]

![1322499-20190713144834363-1012564963.png][]

**微分**

**![1322499-20190713145009457-1453354605.png][]**

t=Derivative(sin(x),x) #t=sin(x)
    print(t)
    t.doit() #求导
    Derivative(sin(x), x)
    Out[13]: cos(x)

![1322499-20190713145201641-927480833.png][]

diff(sin(2*x),x)
    Out[18]: 2*cos(2*x)
    
    sin(2*x).diff(x)
    Out[19]: 2*cos(2*x)
    
    diff(sin(2*x),x,2)  #2阶导
    Out[20]: -4*sin(2*x)
    
    diff(sin(2*x),x,3)   #3阶导
    Out[21]: -8*cos(2*x)

![1322499-20190713145501829-2053729630.png][]

![1322499-20190713145543809-1230537275.png][]

diff(sin(x*y), x,2,y,3) 
    Out[22]: x*(x**2*y**2*cos(x*y) + 6*x*y*sin(x*y) - 6*cos(x*y))

**微分方程**

**![1322499-20190713145701156-1804129262.png][]**

![1322499-20190713145719606-859776866.png][]

![1322499-20190713145737031-1334113338.png][]

**积分**

**![1322499-20190713150503093-1839710978.png][]**

![1322499-20190713150525978-822387320.png][]

![1322499-20190713150544310-454330389.png][]

![1322499-20190713150621548-867848257.png][]

![1322499-20190713150638852-679892926.png][]

转载于:https://www.cnblogs.com/caiyishuai/p/11180775.html

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