Calculator Expressions
Two similar calculators use expressions, summary curve calculator and grid cell calculator. These two variants share the text parsing for calculator expressions.
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
| OPERATOR | DEFINITION |
|---|---|
| := | Assignment |
## Example
MY_VARIABLE := b + c
Basic Operators
| OPERATOR | DEFINITION |
|---|---|
| + | Addition |
| - | Subtraction |
| * | Multiplication |
| / | Division |
| % | Modulus |
| ^ | Power |
## Example
a := (b * c) + d / 10.5
Conditionals
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
| FUNCTION | DEFINITION |
|---|---|
| avg | Average |
| max | Maximum |
| min | Minimum |
| sum | Sum |
## Example: Use the accumulated sum for all PORV values to compute the normalized PORV
NORMALIZED_PORV := x/sum(PORV)
Trigonometry Functions
| FUNCTION | DEFINITION |
|---|---|
| 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
| FUNCTION | DEFINITION |
|---|---|
| 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 |