Revit有效的公式语法和缩写 [课程编码1085]

Formulas support standard arithmetic operations and trigonometric functions.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
  
• Natural logarithm—ln
  
• Square root—sqrt: sqrt(16)
  
• Sine—sin
  
• Cosine—cos
  
• Tangent—tan
  
• Arcsine—asin
  
• Arccosine—acos
  
• Arctangent—atan
  
• e raised to an x power—exp(x)
  
• Absolute Value—abs
  
• Pi—pi (3.1415926...)
  

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)
  
• Area = pi() * Radius ^ 2
  
• Volume = Length (500mm) * Width (300mm) * Height (800 mm)
  
• Width = 100m * cos(angle)
  
• x = 2*abs(a) + abs(b/2)
  
• ArrayNum = Length/Spacing
  

You can use the round function for values in formulas.Function syntaxDescriptionExamples
round(x)The round function returns a value rounded to the nearest whole number. It doesn't take into consideration rounding direction.round(3.1) = 3round(3.5) = 4round(-3.7) = -4
roundup(x)The roundup function returns a value to the largest integral value greater than or equal to x.roundup(3) = 3roundup(3.1) = 4roundup(-3.7) = -3
rounddown(x)The rounddown function returns a value to the smallest integral value less than or equal to x.rounddown(3) = 3rounddown(3.7) = 3rounddown(-3.7) = -4

Parameter names in formulas are case sensitive. For example, if a parameter name begins with a capital letter, such as Width, you must enter it in the formula with an initial capital letter. If you enter it in a formula using lower-case letters instead, for example, width * 2, the software will not recognize the formula.Note: It is recommended that you do not use a dash (-) when naming parameters.