Calculator Expressions

Two similar calculators use expressions, summary curve calculator and grid cell calculator. These two variants share the text parsing for calculator expressions.

Grid Property Calculator

Summary Curve Calculator

ResInsight supports a subset of the features supported in the exprtk parsing library. Scripting features like for/while loops are not supported. The full documentation for the expression parser is available at C++ Mathematical Expression Toolkit Library

Operators and Functions

Possible operations and functions are found by right-clicking in the expression window.

Comment lines

Create a comment line by prefixing with // or ##

// Valid comment line 2
## Valid comment line 1

Assignment Operators

:= Assignment
## Example
MY_VARIABLE := b + c

Basic Operators

+ Addition
- Subtraction
* Multiplication
/ Division
% Modulus
^ Power
## Example
a := (b * c) + d / 10.5


if-then-else statements can be used to assign values based on the individual values in a vector. The following case will assign 0.01 if the TRANX is below 0.01, else copy the original TRANX value.

## Example
NEW_TRANX := if((TRANX < 0.01), 0.01, TRANX)

Scalar Functions

avg Average
max Maximum
min Minimum
sum Sum
## Example: Use the accumulated sum for all PORV values to compute the normalized PORV

Trigonometry Functions

acos Arc cosine (in radians)
acosh Inverse hyperbolic cosine (in radians)
asin Arc sine (in radians)
asinh Inverse hyperbolic sine (in radians)
atan Arc tangent (in radians)
atanh Inverse hyperbolic tangent (in radians)
cos Cosine
cosh Hyperbolic cosine
cot Cotangent
csc Cosecant
deg2rad Convert x from degrees to radians
deg2grad Convert x from degrees to radians
rad2deg Convert x from radians to degrees
grad2deg Convert x from radians to degrees
sec Secant
sin Sine
sinc Sine cardinal
sinh Hyperbolic sine
tan Tangent
tanh Hyperbolic tangent

Vector Functions

abs Absolute value
ceil Rounding up
floor Rounding down
frac Fractional portion of input
log Natural logarithm
log10 Base 10 logarithm
pow Power
round Round x to the nearest integer
sgn Sign of x, -1 where x < 0, +1 where x > 0, else zero
sqrt Square root
trunc Integer portion of input