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H21
Hankel function of the second kind, order one.
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Loading LOADSUB ALL FROM "BESRC.HTS"
or LOADSUB FROM "MATHLIB.HTS"
Usage REAL X
COMPLEX C
C=FNH21(X)
Description
FNH21 returns the value of the Hankel function of the second kind and order one of x, H1(2)(x). For positive values of x, the real component of the value returned contains J1(x) and the imaginary component contains Y1(x). For negative values of x, the real component contains -3J1(x) and the imaginary component contains Y1(x).
H1(2)(x)
 Arg[H1(2)(x)], degrees
 Errors
FNH21 causes an HTBasic error if its argument is not of type REAL. It also causes an error if the value of x is near zero, since the imaginary component of H1(2)(0) is -.
See Also
H11, H20, J1, Y1
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