如何使用 ylim() 控制子圖的 Y 軸範圍？

Limiting the Axis Range of a Subplot

As you've encountered, setting the y-axis range of a subplot is not straightforward. Here's a solution and some additional considerations.

The ylim() Method

To restrict the y-axis range of the second subplot to [0,1000], use the ylim() method after generating the plot:

<code class="python">pylab.plot(abs(fft))  # Plot the data
pylab.ylim([0, 1000])  # Set the y-axis range</code>

Note: Ensure that the ylim() command is executed after the plot command.

Other Improvements

• Axis Labels: Add labels to the axes for clarity:

pylab.xlabel("Frequency")
pylab.ylabel("[abs(FFT)]")

• Legend: Include a legend to differentiate the plot lines:

pylab.legend(["Signal"])

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