NMODL's built-in functions

acos(x) - compute the arc cosine
: Returns the arc cosine of its argument ($arccosx$). 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 ($arcsinx$). 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 ($arctanx$).

atan2(y,x) - compute the arc tangent of y/x
: Returns the arc tangent of the ratio $y/x$ ($arctany/x$).

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 ($cosx$). The angle is expressed in radians.

cosh(x) - compute the hyperbolic cosine
: Returns the hyperbolic cosine for a real argument ($coshx$).

exp(x) - compute the exponential function
: Returns the value of $e$ raised to the argument power ($ex$).

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 $y$ ($x\; y$), the remainder resulting from $x/y$.

log(x) - compute the natural logarithm
: Returns the natural logarithm of its argument ($lnx$).

log10(x) - compute the base 10 logarithm
: Returns the base 10 logarithm of its argument ($log$₁₀ x).

pow(x,y) - compute x raised to the y power
: Returns the value of $x$ raised to the power of $y$ ($xy$).

sin(x) - compute the sine
: Returns the sine of its argument ($sinx$). The angle is expressed in radians.

sinh(x) - compute the hyperbolic sine
: Returns the hyperbolic sine for a real argument ($sinhx$).

sqrt(x) - compute the square root
: Returns the positive square root of its argument ($x$).

tan(x) - compute the tangent
: Returns the tangent of its argument ($tanx$). The angle is expressed in radians.

tanh(x) - compute the hyperbolic tangent
: Returns the hyperbolic tangent for a real argument ($tanhx$).