1 USING: help.markup help.syntax math.functions math ;
4 ARTICLE: "math.libm" "C standard library math functions"
5 "The words in the " { $vocab-link "math.libm" } " vocabulary call C standard library math functions. They are used to implement words in the " { $vocab-link "math.functions" } " vocabulary."
7 "These functions are unsafe. The compiler special-cases them to operate on floats only. They can be called directly, however there is little reason to do so, since they only implement real-valued functions, and in some cases place restrictions on the domain:"
8 { $example "USE: math.functions" "2.0 acos ." "C{ 0.0 1.316957896924817 }" }
9 { $unchecked-example "USE: math.libm" "2.0 facos ." "0/0." } }
10 "Trigonometric functions:"
19 "Hyperbolic functions:"
24 "Exponentials and logarithms:"
39 { $values { "x" real } { "double" real } }
40 { $description "Calls the inverse trigonometric cosine function from the C standard library. User code should call " { $link acos } " instead." } ;
43 { $values { "x" real } { "double" real } }
44 { $description "Calls the inverse trigonometric sine function from the C standard library. User code should call " { $link asin } " instead." } ;
47 { $values { "x" real } { "double" real } }
48 { $description "Calls the inverse trigonometric tangent function from the C standard library. User code should call " { $link atan } " instead." } ;
51 { $values { "x" real } { "y" real } { "double" real } }
52 { $description "Calls the two-parameter inverse trigonometric tangent function from the C standard library. User code should call " { $link arg } " instead." } ;
55 { $values { "x" real } { "double" real } }
56 { $description "Calls the trigonometric cosine function from the C standard library. User code should call " { $link cos } " instead." } ;
59 { $values { "x" real } { "double" real } }
60 { $description "Calls the trigonometric sine function from the C standard library. User code should call " { $link sin } " instead." } ;
63 { $values { "x" real } { "double" real } }
64 { $description "Calls the hyperbolic cosine function from the C standard library. User code should call " { $link cosh } " instead." } ;
67 { $values { "x" real } { "double" real } }
68 { $description "Calls the hyperbolic sine function from the C standard library. User code should call " { $link sinh } " instead." } ;
71 { $values { "x" real } { "double" real } }
72 { $description "Calls the exponential function (" { $snippet "y=e^x" } ") from the C standard library. User code should call " { $link e^ } " instead." } ;
75 { $values { "x" real } { "double" real } }
76 { $description "Calls the natural logarithm function from the C standard library. User code should call " { $link log } " instead." } ;
79 { $values { "x" real } { "double" real } }
80 { $description "Calls the base 10 logarithm function from the C standard library. User code should call " { $link log10 } " instead." } ;
83 { $values { "x" real } { "y" real } { "double" real } }
84 { $description "Calls the power function (" { $snippet "z=x^y" } ") from the C standard library. User code should call " { $link ^ } " instead." } ;
87 { $values { "x" real } { "double" real } }
88 { $description "Calls the square root function from the C standard library. User code should call " { $link sqrt } " instead." } ;