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在下面的代码片段中,我得到了y轴和x轴次要网格线。我如何去绘制x轴次要网格线?这里是我的代码片段:在Python中绘制x-y图形中的x轴次要网格线
plt.subplot(212)
plt.ylim((-500,500))
plt.yticks(np.arange(-500,501,100))
plt.xlim((0,8))
plt.plot(time_ms, freq)
plt.plot(time_ms, y2, color='r', lw=1)
plt.plot(time_ms, y3, color='r', lw=1)
plt.fill_between(time_ms, y2, 500, color='red', alpha=0.3)
plt.fill_between(time_ms, y3, -500, color='red', alpha=0.3)
plt.grid(b=True, which='major', color='k', linestyle='-')
plt.grid(which='minor', color='k', linestyle=':', alpha=0.5)
plt.title("Response Plot")
plt.xlabel('Time (ms)')
plt.ylabel('Voltage (V)')
plt.minorticks_on()
plt.show()