libopenjpeg: rename decoder source file.

[ffmpeg] / doc / eval.texi

diff --git a/doc/eval.texi b/doc/eval.texi
index ac27750851686e7a2bdb582a4d0c16f9189f6463..18d848749a0fb8db244ea6208a3fc200486667f9 100644 (file)
--- a/doc/eval.texi
+++ b/doc/eval.texi
@@ -83,6 +83,30 @@ Return 1.0 if @var{expr} is zero, 0.0 otherwise.
 @item pow(x, y)
 Compute the power of @var{x} elevated @var{y}, it is equivalent to
 "(@var{x})^(@var{y})".
+
+@item random(x)
+Return a pseudo random value between 0.0 and 1.0. @var{x} is the index of the
+internal variable which will be used to save the seed/state.
+
+@item hypot(x, y)
+This function is similar to the C function with the same name; it returns
+"sqrt(@var{x}*@var{x} + @var{y}*@var{y})", the length of the hypotenuse of a
+right triangle with sides of length @var{x} and @var{y}, or the distance of the
+point (@var{x}, @var{y}) from the origin.
+
+@item gcd(x, y)
+Return the greatest common divisor of @var{x} and @var{y}. If both @var{x} and
+@var{y} are 0 or either or both are less than zero then behavior is undefined.
+@end table
+
+The following constants are available:
+@table @option
+@item PI
+area of the unit disc, approximatively 3.14
+@item E
+exp(1) (Euler's number), approximatively 2.718
+@item PHI
+golden ratio (1+sqrt(5))/2, approximatively 1.618
 @end table
 
 Note that: