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Revit有效的公式语法和缩写 [课程编码1085]

发布者: 命运*** | 发布时间: 2021-1-27 10:09| 查看数: 2028| 评论数: 0|帖子模式

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.

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