Matplotlib.axis.Axis.format_cursor_data() function in Python

Matplotlib.axis.Axis.format_cursor_data() function in Python

In matplotlib, the format_cursor_data method of the Axis class is not one that end-users typically interact with directly. Instead, it's used internally to provide a default representation for the data under the cursor when no specific formatting is specified.

The format_cursor_data function converts data (usually a numerical value) into a string representation, which is then displayed when the cursor hovers over a data point in the interactive backends of matplotlib.

Here's a general description of its usage:

format_cursor_data(data)
  • data: This is the data you want to convert into a string representation.

This function returns the string representation of the data.

However, for most applications, you would use ax.format_xdata and ax.format_ydata to customize how data is displayed in the status bar of interactive backends.

Here's a simple example to demonstrate this:

import numpy as np import matplotlib.pyplot as plt x = np.linspace(0, 10, 1000) y = np.sin(x) fig, ax = plt.subplots() # Custom formatting function def format_func(value, axis): return f"Value: {value:.2f}" ax.format_xdata = format_func ax.format_ydata = format_func ax.plot(x, y) plt.show()

In this example, when you hover over a point in the plot using an interactive backend, the x and y values of the cursor's position will be displayed in the format Value: <value> with two decimal places.

Remember, the primary use of format_cursor_data is internal, and for customizing cursor data formatting, you'll often use ax.format_xdata and ax.format_ydata directly.

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