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Matplotlib for Python Developers by Sandro Tosi

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Polar charts

Polar plots use a completely different coordinate system, so we have dedicated a separate section to them.

For all the previous images, we used the Cartesian system—two perpendicular lines meet at a point (the origin of axes) with precise axes directions to determine positive and negative values on both, the X and Y axes.

A polar system is a two-dimensional coordinate system, where the position of a point is expressed in terms of a radius and an angle. This system is used where the relationship between two points is better expressed using those information.

As mentioned earlier, there are two coordinates—the radial and the angular coordinates. The radial coordinate, represented as r, denotes the point distance from a central point (called ...

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