计算概率--三角形概率

标签：rom   expec   lse   int   font   size   ==   pre   span   

from sympy import integrate
from sympy.abc import x
import random



#integrate（参数1=概率密度函数，参数2=积分起始点，参数3=积分结束点）

概率密度函数：
           a<=x<=medic:2*(x-a)/((b-a)*(c-a))
           medic<=x<=6:2*(b-x)/((b-a)*(b-c))

def pro(expect_roi,mina,maxb,medic):

    if expect_roi >= mina and expect_roi <= medic:
        prob = (1 - integrate(2 * (x - mina) / ((maxb - mina) * (medic - mina)), (x, mina, expect_roi)))
        if prob == 1:
            prob = random.uniform(0.95, 0.98)
    elif expect_roi > medic and expect_roi <= maxb:
        prob = 1 - (integrate(2 * (maxb - x) / ((maxb - mina) * (maxb - medic)), (x, medic, expect_roi)) + integrate(
            2 * (x - mina) / ((maxb - mina) * (medic - mina)), (x, mina, medic)))
        if prob == 0:
            prob = random.uniform(0.001, 0.1)
    elif expect_roi < mina:
        prob = random.uniform(0.9, 0.999)
    else:
        prob = random.uniform(0.001, 0.1)
    print(float(prob))
pro(3,2,10,6)#0.96875
pro(5,2,10,6)#0.71875
pro(7,2,10,6)#0.28125
pro(9,2,10,6)#0.03125

计算概率--三角形概率

标签：rom   expec   lse   int   font   size   ==   pre   span   

原文地址：https://www.cnblogs.com/hapyygril/p/9718111.html