仅在左侧绘制，并显示黑条而不是x轴标签

Question

我有一个通过读取CSV文件生成的图，出于某种原因，当它被绘制时，它做了一件非常奇怪的事情，把图一直压到了图的左边，并用黑条代替了xlabels。我已经包含了一个绘图的图像，以向您展示我的意思，以及用于绘制它的代码。任何帮助都将不胜感激。

def plot_exp(self, filename):  # Plots what is selected using expButton, using the filename from exp_clicked
    self.axes.set_xlim(200, 3000)  # Sets the axes limits
    self.axes.set_xlabel('Energy (eV)')  # Sets the x label
    self.axes.set_ylabel('Intensity (a.u.)')  # Sets the y label
    df = pd.read_csv(filename, sep='\t')  # Reads the .csv file with appropriate separator
    df_exp = df[df.columns[::2]]  # Skips every other column in the .csv file as each is exported twice
    df_exp = df_exp.drop(df_exp.columns[1], axis=1)  # Drops the first column which is irrelevant
    df_exp = df_exp.drop(df_exp.columns[2:7], axis=1)  # Drops columns 2-7 which are also irrelevant
    df_exp.columns = ['Energy', 'Intensity']  # Renames columns
    df_exp = df_exp[df_exp['Intensity'] > 0]  # Only reads data points which are greater than 0
    df_exp['Energy'] = df_exp['Energy'].str.replace(',', '')  # Replaces the comma separator with nothing
    df_exp.to_csv('/Volumes/GoogleDrive/My Drive/MAT 395/Project/Exported Data/Experimental_Plot.csv', index=False)
    # Exports plotted data to .csv
    self.axes.plot(df_exp['Energy'], df_exp['Intensity'])  # Plots the experimental data file
    self.draw()  # Draws the plot onto the canvas

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Answer 1

df_exp['Energy'].dtype是np.object，所以不能解释为float。解决方案是将其类型转换为float

df_exp['Energy'] = df_exp['Energy'].astype(np.float, copy=False)