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(-)b/lib/msun/src/e_jn.c (-6 / +6 lines)
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 *	y0(0)=y1(0)=yn(n,0) = -inf with division by zero signal;
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 *	y0(0)=y1(0)=yn(n,0) = -inf with division by zero signal;
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 *	y0(-ve)=y1(-ve)=yn(n,-ve) are NaN with invalid signal.
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 *	y0(-ve)=y1(-ve)=yn(n,-ve) are NaN with invalid signal.
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 * Note 2. About jn(n,x), yn(n,x)
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 * Note 2. About jn(n,x), yn(n,x)
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 *	For n=0, j0(x) is called,
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 *	For n=0, j0(x) is called.
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 *	for n=1, j1(x) is called,
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 *	For n=1, j1(x) is called.
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 *	for n<x, forward recursion us used starting
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 *	For n<x, forward recursion is used starting
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 *	from values of j0(x) and j1(x).
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 *	from values of j0(x) and j1(x).
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 *	for n>x, a continued fraction approximation to
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 *	For n>x, a continued fraction approximation to
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 *	j(n,x)/j(n-1,x) is evaluated and then backward
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 *	j(n,x)/j(n-1,x) is evaluated and then backward
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 *	recursion is used starting from a supposed value
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 *	recursion is used starting from a supposed value
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 *	for j(n,x). The resulting value of j(0,x) is
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 *	for j(n,x). The resulting values of j(0,x) or j(1,x) are
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 *	compared with the actual value to correct the
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 *	compared with the actual values to correct the
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 *	supposed value of j(n,x).
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 *	supposed value of j(n,x).
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 *
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 *
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 *	yn(n,x) is similar in all respects, except
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 *	yn(n,x) is similar in all respects, except

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