How Does the `s` Parameter Affect Marker Size in Matplotlib\'s Scatter Plots?

pyplot Scatter Plot Marker Size

When creating scatter plots using pyplot, the s parameter determines the size of the markers. This parameter is specified in "points^2", which refers to the area of the marker.

The relationship between s and the marker size is exponential. Doubling the value of s will quadruple the area of the marker, giving the impression of doubling the size. Conversely, halving the value of s will reduce the area of the marker by a factor of four, making it appear half the size.

It's important to note that the concept of "points" is somewhat arbitrary in this context. The actual size of a marker will depend on the resolution of your display and the scaling of your plot. However, by understanding the exponential relationship between s and the marker area, you can control the relative sizes of your markers.

To clarify, the examples provided in the answer demonstrate this exponential relationship.

• Doubling the width of the marker corresponds to multiplying s by 4 (2^2).
• Doubling the area of the marker corresponds to multiplying s by 2 (2^1).

The latter example is considered more intuitive because doubling the area of a circle visually doubles its apparent size, whereas doubling the width alone increases the area by a factor of 4, resulting in a more drastic increase in apparent size.

Remember, markers appear larger when their area increases, and the relationship between s and marker area is exponential. By adjusting the value of s, you can control the relative sizes of your markers to create meaningful and effective scatter plots.

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