name 'arange' is not defined
时间: 2023-05-02 18:01:50 浏览: 216
这个错误提示是因为你在代码中使用了 "arange" 这个函数,但是Python并不认识它。可能是因为你没有正确导入NumPy模块,在使用NumPy中的函数之前,需要先导入NumPy模块。可以在代码开头加上以下代码:
```
import numpy as np
```
这将导入NumPy模块并给它起别名 np,之后就可以正常使用NumPy中的函数了,如:
```
np.arange(10)
```
相关问题
NameError: name 'Break' is not defined
NameError: name 'Break' is not defined
This error occurs when the name "Break" is not recognized as a defined variable or function in the current context. In Python, "break" is a keyword used to exit from a loop, but it should not be as a variable or function name.
If you intended to use the "break" keyword to exit a loop, make sure it is spelled correctly and used within a loop structure. Here's an example:
```
for i in range(10):
if i == 5:
break
print(i)
```
If you meant to use "Break" as a variable or function name, you need to define it before using it. For example:
```
Break = 10
print(Break)
```
Make sure to avoid using reserved keywords as variable or function names to prevent such errors.
NameError: name 'y' is not defined
抱歉,这是因为代码中没有定义变量y,需要在代码中定义y的取值范围。下面是更新后的代码:
```python
import numpy as np
import matplotlib.pyplot as plt
# 定义x和y的取值范围
x = np.arange(-50, 50, 0.1)
y = np.arange(-50, 50, 0.1)
# 计算出y1和y2的值
y1 = -x + 2 * (0.5 * x + 0.5 * y + 45) - 90
y2 = -4 * x - 10 * (0.5 * x + 0.5 * y + 45) + 490
# 绘制直线
plt.plot(x, y1, label='Line 1')
plt.plot(x, y2, label='Line 2')
# 添加标签和标题
plt.xlabel('x')
plt.ylabel('y')
plt.title('Two Lines')
# 显示图例
plt.legend()
# 显示图形
plt.show()
```
运行更新后的代码,即可得到绘制出的两条直线图像。