Adding A Formula To A Parameter; Valid Formula Syntax And Abbreviations - Autodesk 24000-000000-9860 - Revit Architecture - PC User Manual

Adding a Formula to a Parameter

1 In the Family Editor, lay out reference planes.
2 Add dimensions, as required.
3 Label the dimensions. See
4 Add the geometry, and lock the geometry to the reference planes.
5 On the Design Bar, click Family Types.
6 In the Family Types dialog, in the Formula column next to the appropriate parameter, type the
formula for the parameter. For more information about entering formulas, see
Syntax and Abbreviations

Valid Formula Syntax and Abbreviations

Formulas support the following arithmetic operations: addition, subtraction, multiplication, division,
exponentiation, logarithms, and square roots. Formulas also support the following trigonometric functions:
sine, cosine, tangent, arcsine, arccosine, and arctangent.
The valid formula abbreviations for arithmetic operations and trigonometric functions are
Addition— +
Subtraction— -
Multiplication—*
Division—/
Exponentiation—^: x^y, x raised to the power of y
Logarithm—log
Square root—sqrt: sqrt(16)
Sine—sin
Cosine—cos
Tangent—tan
Arcsine—asin
Arccosine—acos
Arctangent—atan
e raised to an x power—exp
Absolute Value—abs
You can enter integers, decimals, and fractional values in formulas, using normal mathematical syntax, as
shown in the examples below:
Length = Height + Width + sqrt(Height*Width)
Length = Wall 1 (11000mm)+ Wall 2 (15000mm)
Area = Length (500mm) * Width (300mm)
Volume = Length (500mm) * Width (300mm) * Height (800 mm)
Labeling Dimensions on page 359.
on page 367.
Using Formulas for Numerical Parameters | 367
Valid Formula