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Added Arrow Annotation Feature to
plot2D_samples_matFunctionChanges:
New Parameter
draw_arrows: Introduced an optional boolean parameterdraw_arrowsto theplot2D_samples_matfunction. When set toTrue, this parameter allows users to plot arrows in the middle of the lines connecting source and target samples. This helps to visually identify the direction from source to target.Arrow Placement: The arrows are strategically placed at the midpoint of the lines for clear visualization.
Arrow Properties: The color and alpha (transparency) of the arrows match the lines they are associated with, ensuring visual consistency.
As a visual example, this update allows the user to choose between these two types.


Motivation:
The addition of the arrow annotation feature enhances the visual representation of the connections between source and target samples. Especially in cases where directionality matters, these arrows provide a clearer understanding of the flow from source to target.
Code:
The main code changes involve:
plt.annotatemethod to draw an arrow at the calculated midpoint.Example Usage:
Types of changes
Motivation and context / Related issue
How has this been tested (if it applies)
PR checklist