Define the Formula Field
The variable is defined in the Formula field.
For example, the variable can be a letter A, character string Height, or clause of the other variables and numbers. As an example A*2+B.
This requires that the variables used in the calculation have been specified.
The acceptable characters in variable names include:
- numbers (0-9)
- letters (A-Z, a-z)
- special character underscore (_).
Note:
- A space is an unacceptable character in a variable’s name. The maximum length of a name is 16 characters.
- A number is an acceptable character in the beginning of the name when using an expression, for example, 0.5*Length.
- You get the numeric value of a dimension displayed by: Select
> 
User Preferences > 
Drawings, Models > View > 
Show Formulas.
The following mathematical operations are available
The argument x and/or y can be real number or formula giving a numerical value.
| Calculation | Meaning |
| + | Addition |
| - | Subtraction |
| * | Multiplication |
| / | Division |
| abs(x) | Absolute value |
| acos(x) | |
| asin(x) | |
| atan(x) | |
| cos(x) | |
| exp(x) | Exponential function |
| int(x) | Integer rounding |
| log(x) | Natural logarithm |
| pow(x,y) | x to the power of y |
| sin(x) | |
| sqrt(x) | Square root |
| tan(x) |