解決VPYTHON/python中的VIBRATNIG STRING仿真問題

Question

我是 python 的真正初學者，現在我被下面的代碼困住了，我不知道如何繼續前進。 它沒有向我顯示我正在嘗試編碼的曲線。 這個想法是它將顯示兩個球（它們正在工作）和它們之間的弦，它們將像振動的吉他弦一樣以慢動作移動。

請給我一些建議

from vpython import *
import math

rho = 0.01
ten = 40.
c = math.sqrt(ten / rho)  # 4000
c1 = c
ratio = c * c / (c1 * c1)
steps = 101
x = list(range(0, 100))
y = list(range(0, 100))

g = canvas(width=600, height=400, title="Vibrating string")
string = curve(x, y, color=color.yellow, radius=0.5, x0=steps * [0.], x1=steps * [0.], x2=steps * [0.])
ball1 = sphere(pos=vector(50, 0, 0), radius=2.0, color=color.red)
ball2 = sphere(pos=vector(-50, 0, 0), radius=2.0, color=color.red)

for i in range(0, 81):
    string.x0[i] = 0.00125 * i
for i in range(81, steps):
    string.x0[i] = 0.1 - 0.005 * (i - 80)
for i in range(0, 100):
    string.x[i] = 2.0 * i - 100.0
    string.y[i] = 300.0 * string.x0[i]
    string.pos = vector(string.x[i], string.y[i], 0)

for i in range(1, 100):
    string.x1[i] = string.x0[i] + 0.5 * ratio * (string.x0[i + 1] + string.x0[i + 1] - 2 * string.x0[i])
    string.x0[i] = string.x1[i]

while 1:
    rate(50)

    for i in range(1, 100):
        string.x2[i] = 2. * string.x1[i] - string.x0[i] + ratio * (
                string.x1[i + 1] + string.x1[i - 1] - 2 * string.x1[i])
        string.modify(i, y=string.x1[i])

    for i in range(0, 100):
        string.x[i] = 2.0 * i - 100.0
        string.y[i] = 300.0 * string.x2[i]
        string.pos = vector(string.x[i], string.y[i], 0)

    for i in range(0, 101):
        string.x0[i] = string.x1[i]
        string.x1[i] = string.x2[i]

Answer 1

曲線 object 沒有屬性“x”和“y”，這就是程序給出此錯誤消息的原因：

回溯（最近一次調用）：文件“D:\0C\workspace\glowscript\test.py”，第 24 行，在 string.x[i] = 2.0 * i - 100.0 AttributeError: 'curve' object has no attribute ' X'

這是曲線文檔：

https://www.glowscript.org/docs/VPythonDocs/curve.html

一個小問題：您不需要導入數學。 當你說“from vpython import *”時，數學模塊會自動導入。