当互补角度（例如 30 和 60）传递给 xy_plot1 和 xyplot2 函数时，两个射弹的图形无法正常工作

Question

import matplotlib.pyplot as plt

import numpy as np

import math

import matplotlib.gridspec as gridspec

from matplotlib.animation import FuncAnimation

fig = plt.figure()

plt.xlabel('X')

plt.ylabel('Y')

# limiting the y and x axis
plt.ylim(0, 10)

plt.xlim(0, 10)

def xy_plot1(u, theta):

    y_arr1= []
    x_arr1 = []

    # displacement in the y_direction is zero
    x_disp = (u*u)*(math.sin(2*theta))/9.8  # disp_x = (u^2)*sin(2theta)/g {horizontal                                                                                  range}

    x = 0           # distance from the origin

    while(x <= x_disp):
        # below is the equation of path of projectile 
        y = (x*(math.tan(theta))) - ((9.8*x*x)/(2*pow((u*math.cos(theta)), 2)))
        y_arr1.append(y)
        x_arr1.append(x)
        x = x + 0.1 # basically x = x + dx  

    plt.plot(x_arr1, y_arr1)

def xy_plot2(u, theta):

    y_arr2 = []
    x_arr2 = []

    # displacement in the y_direction is zero
    x_disp = (u*u)*(math.sin(2*theta))/9.8  # disp_x = (u^2)*sin(2theta)/g {horizontal                                                                                  range}

    x = 0           # distance from the origin
    dx = 0.1
    while(x <= x_disp):
        # below is the equation of path of projectile 
        y = (x*(math.tan(theta))) - ((9.8*x*x)/(2*pow((u*math.cos(theta)), 2)))
        y_arr2.append(y)
        x_arr2.append(x)
        x = x + dx

    plt.plot(x_arr2, y_arr2)

xy_plot1(10, 60)

xy_plot2(10, 30)

plt.show()

Answer 1

小心！ xyplot() 函数的 theta 参数以度为单位，但在函数内部， math.sin() 函数采用以弧度为单位的角度参数。最简单的解决方法是以弧度而不是度为单位提供您的 theta 参数。

如果它们做完全相同的事情，您也不需要这两个函数，因为 plt.plot() 将绘制后续的射弹曲线以及之前的曲线，只要您不清除绘图。

import matplotlib.pyplot as plt
import numpy as np
import math
import matplotlib.gridspec as gridspec
from matplotlib.animation import FuncAnimation

fig = plt.figure()

plt.xlabel('X')
plt.ylabel('Y')

# limiting the y and x axis
plt.ylim(0, 10)
plt.xlim(0, 10)

def xy_plot(u, theta):
    y_arr2 = []
    x_arr2 = []

    # displacement in the y_direction is zero
    x_disp = (u*u)*(math.sin(2*theta))/9.8  # disp_x = (u^2)*sin(2theta)/g {horizontal                                                                                  range}

    x = 0           # distance from the origin
    dx=0.1
    while(x <= x_disp):
        # below is the equation of path of projectile 
        y = (x*(math.tan(theta))) - ((9.8*x*x)/(2*pow((u*math.cos(theta)), 2)))
        y_arr2.append(y)
        x_arr2.append(x)
        x = x + dx

    plt.plot(x_arr2, y_arr2)

# be careful about using degrees versus radians!!
xy_plot(10, math.pi/3)
xy_plot(10, math.pi/6)
plt.show()

当互补角度（例如 30 和 60）传递给 xy_plot1 和 xyplot2 函数时，两个射弹的图形无法正常工作

the graphs of the two projectiles does not work properly when complementary angles(eg 30 and 60) are passes to xy_plot1 and xyplot2 function

python

python-3.x

matplotlib

graph

projectile