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doc/eval: add missing documentation of functions
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@ -21,32 +21,78 @@ The following unary operators are available: @code{+}, @code{-}.
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The following functions are available:
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@table @option
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@item sinh(x)
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Compute hyperbolic sine of @var{x}.
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@item cosh(x)
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Compute hyperbolic cosine of @var{x}.
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@item tanh(x)
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Compute hyperbolic tangent of @var{x}.
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@item sin(x)
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Compute sine of @var{x}.
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@item cos(x)
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Compute cosine of @var{x}.
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@item tan(x)
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Compute tangent of @var{x}.
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@item atan(x)
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Compute arctangent of @var{x}.
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@item asin(x)
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Compute arcsine of @var{x}.
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@item acos(x)
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Compute arccosine of @var{x}.
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@item exp(x)
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Compute exponential of @var{x} (with base @code{e}, the Euler's number).
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@item log(x)
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Compute natural logarithm of @var{x}.
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@item abs(x)
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Compute absolute value of @var{x}.
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@item squish(x)
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Compute expression @code{1/(1 + exp(4*x))}.
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@item gauss(x)
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Compute Gauss function of @var{x}, corresponding to
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@code{exp(-x*x/2) / sqrt(2*PI)}.
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@item isinf(x)
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Return 1.0 if @var{x} is +/-INFINITY, 0.0 otherwise.
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@item isnan(x)
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Return 1.0 if @var{x} is NAN, 0.0 otherwise.
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@item mod(x, y)
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Compute the remainder of division of @var{x} by @var{y}.
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@item max(x, y)
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Return the maximum between @var{x} and @var{y}.
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@item min(x, y)
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Return the maximum between @var{x} and @var{y}.
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@item eq(x, y)
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Return 1 if @var{x} and @var{y} are equivalent, 0 otherwise.
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@item gte(x, y)
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Return 1 if @var{x} is greater than or equal to @var{y}, 0 otherwise.
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@item gt(x, y)
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Return 1 if @var{x} is greater than @var{y}, 0 otherwise.
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@item lte(x, y)
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Return 1 if @var{x} is lesser than or equal to @var{y}, 0 otherwise.
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@item lt(x, y)
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Return 1 if @var{x} is lesser than @var{y}, 0 otherwise.
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@item st(var, expr)
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Allow to store the value of the expression @var{expr} in an internal
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variable. @var{var} specifies the number of the variable where to
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