Step 1: Understanding the Question:
The question asks which property or parameter in Matplotlib plotting (such as histograms) is used to fill the bars with a pattern (like stripes, dots, or cross-hatching) instead of a solid color.
Step 2: Key Formula or Approach:
In Python's Matplotlib library, the hatch parameter is used to apply fill patterns to patches (including bars in bar charts and histograms).
The pattern is specified as a string containing characters like '/', '
', '|', '-', '+', 'x', 'o', 'O', '.', '*'.
Step 3: Detailed Explanation:
When visualizing data using histograms via plt.hist(), each bar is represented by a rectangle patch.
By default, these patches are filled with a solid color.
To distinguish between multiple distributions in black-and-white printing or for better accessibility, we can apply cross-hatching patterns using the hatch keyword argument.
For example: plt.hist(data, hatch='/') will fill the bars with diagonal stripes.
Let's analyze the other options:
- explode is used in pie charts to separate a slice from the center.
- fill is a boolean property indicating whether to fill the patch with color.
- patch is the class of shape objects but not a pattern property itself.
Thus, hatch is the correct property.
Step 4: Final Answer:
The correct option is (D), which is hatch.