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CAD tip CAD tip # 6381:

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Q - question

Arithmetic functions in AutoCAD fields.

A - answer In AutoCAD table cells and text fields (texts, block attributes) you can use not only the predefined properties, fields and functions but also the standard mathematic (arithmetic and goniometric) functions with dynamic values.

When defining the arithmetic expressions - see Fields > All > Expression - you can use the following functions:

  • +, -, *, /, ^, () = basic arithmetic operations
  • sin(angle) = Sinus of an angle
  • cos(angle) = Cosinus of an angle
  • tang(angle) = Tangens of an angle
  • asin(real) = Arcus sinus
  • acos(real) = Arcus cosinus
  • atan(real) = Arcus tangens
  • ln(real) = Natural logarithm
  • log(real) = Decimal logarithm
  • exp(real) = Natural power
  • exp10(real) = Decimal power
  • sqr(real) = Square
  • sqrt(real) = Square root
  • abs(real) = Absolute value
  • round(real) = Rounded to the nearest integer
  • trunc(real) = Truncated to integer
  • r2d(angle) = Angle in radians converted to degrees
  • d2r(angle) = Angle in degrees converted to radians
  • pi = Pi constant (Ludolf's number)

Example: =atan(pi)

Right-click in the Expression panel of the FIELD dialog and use Insert field... to nest (combine) field expressions and add, subtract, muliply, divide, etc. multiple fields. So you can e.g. multiply the area of the selected closed polyline and its thickness to get the dynamic value of its volume (rt-click, Insert field, object property Area * rt-click, Insert field, object property Thickness). Use "(none)" for formatting the numeric fields.

See video #11

100% *  CAD 
10.11.2008    25758×  
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See also:
Tip 11721:A handy calculator - expression evaluator in 3ds Max.
Tip 11494:Entering decimal values using fractions in CAD applications.
Tip 11289:Adding, multiplying and rounding numbers inside DWG drawing texts - NumInText.
Tip 9630:Inventor trick - conditional parameters (without iLogic)
Tip 9359:Different types of rounding in Inventor parameters.

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