python - TextBackend 仅支持一维范围 : Implicit plotting in Sympy 上的表达式

Question

在执行以下操作时，

from sympy import *
x, y = symbols('x y')
p1 = plot_implicit((Eq(x**2 + y**2, 5)))

我得到以下回溯:

Traceback (most recent call last):
  File "test.py", line 3, in <module>
    p1 = plot_implicit((Eq(x**2 + y**2, 5)))
  File "/home/tinkidinki/.local/lib/python3.6/site-packages/sympy/plotting/plot_implicit.py", line 377, in plot_implicit
    p.show()
  File "/home/tinkidinki/.local/lib/python3.6/site-packages/sympy/plotting/plot.py", line 187, in show
    self._backend.show()
  File "/home/tinkidinki/.local/lib/python3.6/site-packages/sympy/plotting/plot.py", line 1101, in show
    'The TextBackend supports only expressions over a 1D range')
ValueError: The TextBackend supports only expressions over a 1D range

使它成为单变量表达式似乎不会受到影响。你如何在 Sympy 中隐式绘图？

Answer 1

如果您安装 matplotlib，它将使用它而不是 TextBackend 进行绘图。我跑了pip install matplotlib当我尝试你的表达/命令时，它起作用了。