Public Function RD( _ ByVal vX As Variant _ , ByVal vY As Variant _ , ByVal vZ As Variant _ ) As Variant
RD(1, 1, 3) = 0.349720080430692 RD(1, 2, 3) = 0.290460281028991 RD(2, 1, 3) = 0.290460281028991 RD(2, 2, 3) = 0.243386037818348See also:
RC Function RF Function RJ Function DRD FunctionvX: Function returns Null if vX is Null or cannot be fixed up to a Double precision floating point number.
For X and Y nonnegative, X+Y and Z positive, RD(X,Y,Z) = Integral from zero to infinity of (3/2)(t+X)^(-1/2)(t+Y)^(-1/2)(t+Z)^(-3/2) dt. If X or Y is zero, the integral is complete.
Evaluate an INCOMPLETE (or COMPLETE) ELLIPTIC INTEGRAL of the second kind.
The routine calculates an approximation result to RD(X,Y,Z) = Integral from zero to infinity of
-1/2 -1/2 -3/2 (3/2)(t+X) (t+Y) (t+Z) dt,where X and Y are nonnegative, X + Y is positive, and Z is positive. If X or Y is zero, the integral is COMPLETE. The duplication theorem is iterated until the variables are nearly equal, and the function is then expanded in Taylor series to fifth order.
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