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

Note You can use Formula Node most effectively if you are familiar with the C programming language. LabVIEW Help assumes you are familiar with C and does not contain any topics related to programming in C. Refer to The C Programming Language by Brian W. Kernighan and Dennis M. Ritchie or Teach Yourself C by Herbert Schildt for more information.

Function	Corresponding LabVIEW Function	Description
absx	Absolute Value	Returns the absolute value of x.
acosx	Inverse Cosine	Computes the inverse cosine of x in radians.
acoshx	Inverse Hyperbolic Cosine	Computes the inverse hyperbolic cosine of x.
asinx	Inverse Sine	Computes the inverse sine of x in radians.
asinhx	Inverse Hyperbolic Sine	Computes the inverse hyperbolic sine of x.
atanx	Inverse Tangent	Computes the inverse tangent of x in radians.
atan2y, x	Inverse Tangent (2 Input)	Computes the arctangent of y / x in radians.
atanhx	Inverse Hyperbolic Tangent	Computes the inverse hyperbolic tangent of x.
ceilx	Round Toward +Infinity	Rounds x to the next higher integer (smallest integer x.
cosx	Cosine	Computes the cosine of x, where x is in radians.
coshx	Hyperbolic Cosine	Computes the hyperbolic cosine of x.
cotx	Cotangent	Computes the cotangent of x (1/tanx), where x is in radians.
cscx	Cosecant	Computes the cosecant of x (1/sinx), where x is in radians.
expx	Exponential	Computes the value of e raised to the x power.
expm1x	Exponential (Arg) – 1	Computes one less than the value of e raised to the x power (e ^ x – 1).
floorx	Round To –Infinity	Truncates x to the next lower integer (largest integer x.
getexpx	Mantissa & Exponent	Returns the exponent of x.
getmanx	Mantissa & Exponent	Returns the mantissa of x.
intx	Round To Nearest	Rounds x to the nearest integer.
intrzx	—	Rounds x to the nearest integer between x and zero.
lnx	Natural Logarithm	Computes the natural logarithm of x (to the base of e.
lnp1x	Natural Logarithm (Arg +1)	Computes the natural logarithm of x + 1).
logx	Logarithm Base 10	Computes the logarithm of x (to the base of 10).
log2x	Logarithm Base 2	Computes the logarithm of x (to the base of 2).
maxx, y	Max & Min	Compares x and y and returns the larger value.
minx, y	Max & Min	Compares x and y and returns the smaller value.
modx, y	Quotient & Remainder	Computes the remainder of x / y, when the quotient is rounded toward –Infinity.
powx, y	Power of X	Computes x raised to the y power.
rand	Random Number (0 – 1)	Produces a floating-point number between 0 and 1 exclusively.
remx, y	Quotient & Remainder	Computes the remainder of x / y, when the quotient is rounded toward –Infinity.
secx	Secant	Computes the secant of x, where x is in radians (1/cosx).
signx	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.
sinx	Sine	Computes the sine of x, where x is in radians.
sincx	Sinc	Computes the sine of x divided by x (sinx/ x, where x is in radians.
sinhx	Hyperbolic Sine	Computes the hyperbolic sine of x.
sizeOfDimary, di	—	Returns the size of the dimension di specified for the array ary.
sqrtx	Square Root	Computes the square root of x.
tanx	Tangent	Computes the tangent of x, where x is in radians.
tanhx	Hyperbolic Tangent	Computes the hyperbolic tangent of x.