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ATAN within [0,2pi)

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I want to take the arctangent of y/x, with the output in the range [0,2pi). Is there a more elegant way than using

angle = AMOD(ATAN2(y,x)+TWOPI,TWOPI)

where I have defined TWOPI as a parameter?

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0.5*TWOPI-ATAN2(Y,-X)

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