y1l(3m) - osol9

1y0(3M)                  Mathematical Library Functions                  y0(3M)
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NAME

6       y0, y0f, y0l, y1, y1f, y1l, yn, ynf, ynl - Bessel functions of the sec‐
7       ond kind
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SYNOPSIS

10       c99 [ flag... ] file... -lm [ library... ]
11       #include <math.h>
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13       double y0(double x);
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16       float y0f(float x);
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19       long double y0l(long double x);
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22       double y1(double x);
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25       float y1f(float x);
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28       long double y1l(long double x);
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31       double yn(int n, double x);
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34       float ynf(int n, float x);
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37       long double ynl(int n, long double x);
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DESCRIPTION

41       These functions compute Bessel functions of x of  the  second  kind  of
42       orders 0, 1 and n, respectively.
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RETURN VALUES

45       Upon  successful completion, these functions return the relevant Bessel
46       value of x of the second kind.
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49       If x is NaN, a NaN is returned.
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52       If x is negative, −HUGE_VAL or NaN is returned.
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55       If x is 0.0, −HUGE_VAL is returned.
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58       If the correct result would cause overflow, −HUGE_VAL is returned.
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61       For exceptional cases, matherr(3M) tabulates the values to be  returned
62       as specified by SVID3 and XPG3.
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ERRORS

65       No errors are returned.
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USAGE

68       An  application  wanting to check for exceptions should call feclearex‐
69       cept(FE_ALL_EXCEPT) before  calling  these  functions.  On  return,  if
70       fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is
71       non-zero, an exception has been raised. An  application  should  either
72       examine the return value or check the floating point exception flags to
73       detect exceptions.
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ATTRIBUTES

76       See attributes(5) for descriptions of the following attributes:
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81       ┌─────────────────────────────┬─────────────────────────────┐
82       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
83       ├─────────────────────────────┼─────────────────────────────┤
84       │Interface Stability          │See below.                   │
85       ├─────────────────────────────┼─────────────────────────────┤
86       │MT-Level                     │MT-Safe                      │
87       └─────────────────────────────┴─────────────────────────────┘
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90       The y0(), y1(), and yn() functions  are  Standard.  The  y0f(),  y0l(),
91       y1f(), y1l(), ynf(), and ynl() functions are Stable.
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