Question

In case of plots in Python, Marker "3" describes __________.

• A. tri_right
• B. tri_left
• C. tri_down
• D. tri_up

Hint:

Matplotlib numeric markers for triangles are easy to memorize:
- 1 = tri_down, 2 = tri_up, 3 = tri_left, 4 = tri_right.
Just follow the counterclockwise rotation starting from down.

Answer 1

The Correct Option is B

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Step 1: Understanding the Question:
The question is about the marker styles in Matplotlib plots. Specifically, it asks what the string marker "3" represents in Matplotlib's plot styling.

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Step 2: Key Formula or Approach:
Matplotlib has a list of pre-defined marker styles used to highlight individual data points in line plots and scatter plots.
The numerical characters 1, 2, 3, and 4 are used to specify triangular shapes facing different directions:
- 1 represents tri_down (triangle pointing downwards).
- 2 represents tri_up (triangle pointing upwards).
- 3 represents tri_left (triangle pointing to the left).
- 4 represents tri_right (triangle pointing to the right).

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Step 3: Detailed Explanation:
When plotting a chart using Matplotlib, we can specify the marker style using the marker keyword argument.
For example: plt.plot(x, y, marker='3') will mark each data point with a left-pointing triangle (tri_left).
Similarly, marker='1' draws a downward-pointing triangle, marker='2' draws an upward-pointing triangle, and marker='4' draws a right-pointing triangle.
These are also referred to as tri-markers in Matplotlib documentation.
Hence, marker "3" represents tri_left.

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Step 4: Final Answer:
The correct option is (B).