How to Draw a Circle with color changing gradually?

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Hoang Phuc Ho
Hoang Phuc Ho 2015-4-24
评论： Hoang Phuc Ho 2015-4-24
I would like to draw a circle with color changing gradually due to value, in which each point in circle area has the value which is defined by a function of variables are radius and rotation angle.
The image enclosed thank you!

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Punit
Punit 2015-4-24
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Hoang Phuc Ho
Hoang Phuc Ho 2015-4-24
thank you, but if i define the value of each point in the circle area by a matrix of values (because the function is not explicit) , how can i solve in this situation

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