Matplotlib Plots: When to Use `cla()`, `clf()`, or `close()`?

When to Clear, Close, or Purge Your Matplotlib Plots

Matplotlib provides three key functions for managing active plots: cla(), clf(), and close(). Understanding their specific roles is crucial for maintaining a clean and efficient plotting workflow.

cla()

Use cla() (Clear Axis) to remove all data from the currently active axis within the current figure. It leaves other axes unaffected. This is ideal when you wish to refresh a specific subplot without disrupting the entire figure.

clf()

In contrast to cla(), clf() (Clear Figure) removes all axes, data points, and annotations from the entire figure. It leaves the figure window open, allowing you to create a new plot or reuse it for another. Use this function to clear the entire plot area for a fresh start.

close()

close() (Close Figure Window) shuts down the current figure window. Optionally, you can specify a figure number or name to close a specific window. Additionally, close('all') closes all open figure windows. This function is particularly useful when you need to clear multiple plots or free up memory.

Comparison

Function	Purpose
cla()	Clear current axis
clf()	Clear entire figure
close()	Close figure window

Additional Notes

• fig.clf() and fig.clear() are equivalent if fig is the current figure.
• Deleting a figure instance (del fig) does not close the associated window.
• To clear a specific axis using its class methods, use axis.clear().

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