diff options
Diffstat (limited to 'manual/math.texi')
| -rw-r--r-- | manual/math.texi | 45 |
1 files changed, 34 insertions, 11 deletions
diff --git a/manual/math.texi b/manual/math.texi index a97d76c2a1..7de6d169ac 100644 --- a/manual/math.texi +++ b/manual/math.texi @@ -36,8 +36,8 @@ over a domain that is only a subset of real numbers. For example, the @code{1}. If you pass an argument to one of these functions that is outside the domain over which it is defined, the function sets @code{errno} to @code{EDOM} to indicate a @dfn{domain error}. On -machines that support IEEE floating point, functions reporting error -@code{EDOM} also return a NaN. +machines that support @w{IEEE 754} floating point, functions reporting +error @code{EDOM} also return a NaN. Some of these functions are defined mathematically to result in a complex value over parts of their domains. The most familiar example of @@ -59,8 +59,8 @@ instead. In this case, @code{errno} might or might not be set to @code{ERANGE}. The only completely reliable way to check for domain and range errors is -to set @code{errno} to @code{0} before you call the mathematical function -and test @code{errno} afterward. As a consequence of this use of +to set @code{errno} to @code{0} before you call the mathematical function +and test @code{errno} afterward. As a consequence of this use of @code{errno}, use of the mathematical functions is not reentrant if you check for errors. @@ -74,14 +74,37 @@ Handling}, for more information about signals.) @comment ANSI @deftypevr Macro double HUGE_VAL An expression representing a particular very large number. On machines -that use IEEE floating point format, the value is ``infinity''. On -other machines, it's typically the largest positive number that can be -represented. +that use @w{IEEE 754} floating point format, the value is ``infinity''. +On other machines, it's typically the largest positive number that can +be represented. -The value of this macro is used as the return value from various -mathematical functions in overflow situations. +The value of this macro is used as the return value from various +mathematical @code{double} returning functions in overflow situations. @end deftypevr +@comment math.h +@comment GNU +@deftypevr Macro float HUGE_VALf +This macro is similar to the @code{HUGE_VAL} macro except that it is +used by functions returning @code{float} values. + +This macro is a GNU extension. +@end deftypevr + +@comment math.h +@comment GNU +@deftypevr Macro {long double} HUGE_VALl +This macro is similar to the @code{HUGE_VAL} macro except that it is +used by functions returning @code{long double} values. The value is +only different from @code{HUGE_VAL} if the architecture really supports +@code{long double} values. + +This macro is a GNU extension. +@end deftypevr + + +@comment + For more information about floating-point representations and limits, see @ref{Floating Point Parameters}. In particular, the macro @code{DBL_MAX} might be more appropriate than @code{HUGE_VAL} for many @@ -343,7 +366,7 @@ of @var{x} is too large; that is, if overflow occurs. @comment math.h @comment ANSI @deftypefun double tanh (double @var{x}) -This function returns the hyperbolic tangent of @var{x}, whose +This function returns the hyperbolic tangent of @var{x}, whose mathematical definition is @w{@code{sinh (@var{x}) / cosh (@var{x})}}. @end deftypefun @@ -497,7 +520,7 @@ restore that state. @deftypefun {void *} setstate (void *@var{state}) The @code{setstate} function restores the random number state information @var{state}. The argument must have been the result of -a previous call to @var{initstate} or @var{setstate}. +a previous call to @var{initstate} or @var{setstate}. The return value is the previous value of the state information array. You can use thise value later as an argument to @code{setstate} to |