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python零依赖数学库

Project description

nbmath

一个实用的数学工具包,支持方程求解、几何计算、统计分析等功能。

安装

pip install https://ghproxy.net/https://github.com/tc0512/nbmath/releases/download/v1.1.2/nbmath-1.1.2-py3-none-any.whl

快速开始

from nbmath.equation import solve
from nbmath.const import pi
from nbmath.optimize import newton
from nbmath.utils import is_odd, zeros
import os

#解方程
print(solve(1, -3, 2)) #[(2+0j), (1+0j)]

#调用常数
print(pi()) #3.141592653589793

#最小值
TOL = 1e-6
MAX_ITER = 100
print(newton(lambda x: x**2+6*x+9, 1.5, TOL, MAX_ITER)) #x接近-3,y接近0(有浮点误差)

#绘制康托尔阶梯
os.system("python -m nbmath.plots.examples.cantor_stair")

#判断是否为奇数
print(is_odd(99999)) #True

#生成10×10的全零矩阵
print(zeros(10, 10))

模块介绍

常数模块nbmath.const

  • pi tau e - 数学常数
  • G g k NA - 物理常数

方程模块nbmath.solve

  • 一元一次/二次/三次/四次方程求解
  • 牛顿迭代法解高次方程
  • 不等式
  • 高斯消元解线性方程组
  • 统一接口solve

几何模块nbmath.geo

  • Point
  • 线段Line
  • Circle
  • 多边形Polygon

统计模块nbmath.stats

  • mean平均数 percentile百分位数
  • mode众数 var方差 std标准差

工具模块nbmath.utils

  • gcd最大公约数 lcm最小公倍数
  • floor向下取整 trunc截断取整
  • fac阶乘 diff多项式求导
  • np.linspace纯python实现
  • polyval多项式代入求值
  • timer计时器
  • is_even is_odd奇偶数判断
  • eye单位矩阵 ones zeros全一/全零矩阵

优化算法模块nbmath.optimize

  • brute咆哮算法
  • golden_section黄金分割法
  • newton牛顿法
  • gradient_descent梯度下降
  • simulated_annealing模拟退火

绘图模块nbmath.plots

  • point描点 scatter散点图
  • line线段 fun绘制函数F(x)
  • rect矩形
  • mandelbrot heart等共6个示例图案

示例代码

from nbmath.equation import solve
from nbmath.stats import mode
from nbmath.optimize import simulated_annealing
from nbmath import plots as plt
import math
import os

#求解x^4-10x^2+9=0
roots = solve(1, 0, -10, 0, 9)
print(roots) #接近±1,±3,浮点误差可能存在,请以实际使用为准
print(solve(2, 3, ">")) #x>-1.5

data = [1, 1, 2, 3, 4]
print(mode(data)) #[1]

#求y=x^4-5x^2+4的最小值
def F(x):return x**4-5*x**2+4
TEMP = 100
COOLING = 0.95
STEPS = 1000
TOL = 1e-6
print(simulated_annealing(F, -5, 5, TEMP, COOLING, STEPS, TOL)) #{'x': -1.581998612252256, 'fun': -2.249992603725974}

#绘制y=cos(x)
plt.window(800, 600)
plt.setax(-2*math.pi, -1.5*math.pi, 2*math.pi, 1.5*math.pi)
plt.drawaxhline()
plt.plot_function(lambda x: math.sin(x), -2*math.pi, 2*math.pi)
plt.rect(1, 1, 1.5, 0.5, "red") #绘制一个左下角(1,1),长1.5,宽0.5的红色矩形
plt.keep_window()

#绘制威尔斯特拉斯函数
os.system("python -m nbmath.plots.examples.weierstrass")

许可证

MIT

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