python - 如何从文件中绘制多条垂直线？

Question

我一直在尝试使用 matplotlib 向我的绘图添加垂直线，然后在它们之间添加填充。

• thresh_f 是文件名
• thresh_f 只有两列

当文件超过一行时，下面的代码会出错

start, end = np.loadtxt(thresh_f, usecols = [0,1], unpack = True)
ax.axvspan(start, end, alpha=0.3, color='y')

我得到错误:

'bool' object has no attribute 'any'

我对理解这意味着什么一无所知。

Answer 1

问题是当文件多于一行时，您的变量 start 和 end 变成数组。你必须像这样改进你的代码:

start, end = np.loadtxt(thresh_f, usecols = [0,1], unpack = True)
ax = plt.gca()
print (start, end) # test data [ 0.  5.] [ 1.  6.]
# check the type of start variable
# loadtxt may return np.ndarray variable
if type(start) is list or type(start) is tuple or type(start) is np.ndarray:
    for s, e in zip(start, end):
        ax.axvspan(s, e, alpha=0.3, color='y')   # many rows, iterate over start and end
else:
    ax.axvspan(start, end, alpha=0.3, color='y') # single line

plt.show()