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.. _nmodls_built_in_functions:
NMODL's built-in functions
===============
These functions, which are provided by the C language math library, can be called from within NMODL code. With the exception of **abs()**, all expect double-precision floating point arguments and return double-precision floating point values.
**acos(x) - compute the arc cosine**
: Returns the arc cosine of its argument (arccos x). The argument must be in the range -1.0 to 1.0.
**asin(x) - compute the arc sine**
: Returns the arc sine of its argument (arcsin x). The argument must be in the range -1.0 to 1.0.
**atan(x) - compute the arc tangent**
: Returns the arc tangent of its argument (arctan x).
**atan2(y,x) - compute the arc tangent of y/x**
: Returns the arc tangent of the ratio y/x (arctan y/x).
**ceil(x) - round upwards**
: Returns the smallest integral value greater than or equal to its argument (x).
**cos(x) - compute the cosine**
: Returns the cosine of its argument (cos x). The angle is expressed in radians.
**cosh(x) - compute the hyperbolic cosine**
: Returns the hyperbolic cosine for a real argument (cosh x).
**exp(x) - compute the exponential function**
: Returns the value of e raised to the argument power (:math:`e^x`).
**fabs(x) - compute the absolute value of a floating point number**
: Returns the absolute value of its argument (|x|).
**floor(x) - round downwards**
: Returns the largest integral value less than or equal to its argument (x).
**fmod(x,y) - compute x modulo y**
: Returns the value of x modulo y, the remainder resulting from x/y. (In Python this is ``x%y``)
**log(x) - compute the natural logarithm**
: Returns the natural logarithm of its argument (ln x).
**log10(x) - compute the base 10 logarithm**
: Returns the base 10 logarithm of its argument (log10 x).
**pow(x,y) - compute x raised to the y power**
: Returns the value of x raised to the power of y (:math:`x^y`).
**sin(x) - compute the sine**
: Returns the sine of its argument (sin x). The angle is expressed in radians.
**sinh(x) - compute the hyperbolic sine**
: Returns the hyperbolic sine for a real argument (sinh x).
**sqrt(x) - compute the square root**
: Returns the positive square root of its argument (:math:`\sqrt{x}`).
**tan(x) - compute the tangent**
: Returns the tangent of its argument (tan x). The angle is expressed in radians.
**tanh(x) - compute the hyperbolic tangent**
: Returns the hyperbolic tangent for a real argument (tanh x).
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