Formula Node and Expression Node Functions

The following list contains the names of the Formula Node and Expression Node functions, and their descriptions. You also can use these functions with Formula VIs. All function names must be lowercase. You also can use operators and the pi constant in Formula and Expression Nodes.

Function Corresponding LabVIEW Function Description
abs(x) Absolute Value Returns the absolute value of x.
acos(x) Inverse Cosine Computes the inverse cosine of x in radians.
acosh(x) Inverse Hyperbolic Cosine Computes the inverse hyperbolic cosine of x.
asin(x) Inverse Sine Computes the inverse sine of x in radians.
asinh(x) Inverse Hyperbolic Sine Computes the inverse hyperbolic sine of x.
atan(x) Inverse Tangent Computes the inverse tangent of x in radians.
atanh(x) Inverse Hyperbolic Tangent Computes the inverse hyperbolic tangent of x.
ceil(x) Round To +Infinity Rounds x to the next higher integer (smallest integer x).
ci(x) Cosine Integral Computes the cosine integral of x where x is any real number.
cos(x) Cosine Computes the cosine of x, where x is in radians.
cosh(x) Hyperbolic Cosine Computes the hyperbolic cosine of x.
cot(x) Cotangent Computes the cotangent of x (1/tan(x)), where x is in radians.
csc(x) Cosecant Computes the cosecant of x (1/sin(x)), where x is in radians.
exp(x) Exponential Computes the value of e raised to the x power.
expm1(x) Exponential (Arg) – 1 Computes one less than the value of e raised to the x power ((e^x) – 1).
floor(x) Round To –Infinity Truncates x to the next lower integer (largest integer x).
gamma(x) Gamma Function (n + 1) = n! for all natural numbers n.
getexp(x) Mantissa & Exponent Returns the exponent of x.
getman(x) Mantissa & Exponent Returns the mantissa of x.
int(x) Round To Nearest Rounds x to the nearest integer.
intrz(x) Rounds x to the nearest integer between x and zero.
ln(x) Natural Logarithm Computes the natural logarithm of x (to the base of e).
lnp1(x) Natural Logarithm (Arg +1) Computes the natural logarithm of (x + 1).
log(x) Logarithm Base 10 Computes the logarithm of x (to the base of 10).
log2(x) Logarithm Base 2 Computes the logarithm of x (to the base of 2).
max(x,y) Max & Min Compares x and y and returns the larger value.
min(x,y) Max & Min Compares x and y and returns the smaller value.
mod(x,y) Quotient & Remainder Computes the remainder of x/y, when the quotient is rounded toward –Infinity.
pi(x) Represents the value = 3.14159... pi(x) = x *
pi(1) =
pi(2.4) = 2.4 *
rand( ) Random Number (0 – 1) Produces a floating-point number between 0 and 1 exclusively.
rem(x,y) Quotient & Remainder Computes the remainder of x/y, when the quotient is rounded to the nearest integer.
sec(x) Secant Computes the secant of x, where x is in radians (1/cos(x)).
si(x) Sine Integral Computes the sine integral of x where x is any real number.
sign(x) Sign Returns 1 if x is greater than 0, returns 0 if x is equal to 0, and returns –1 if x is less than 0.
sin(x) Sine Computes the sine of x, where x is in radians.
sinc(x) Sinc Computes the sine of x divided by x (sin(x)/x), where x is in radians.
sinh(x) Hyperbolic Sine Computes the hyperbolic sine of x.
spike(x) Spike Function spike(x) returns: 1 if 0 x 1
0 for any other value of x.
sqrt(x) Square Root Computes the square root of x.
square(x) Square Function square (x) returns: 1 if 2n x (2n + 1)
0 if 2n + 1 x (2n + 2)
where x is any real number and n is any integer.
step(x) Step Function step(x) returns: 0 if x < 0
1 if any other condition obtains.
tan(x) Tangent Computes the tangent of x, where x is in radians.
tanh(x) Hyperbolic Tangent Computes the hyperbolic tangent of x.