Stats

  • Locked Locked
  • Replies 13
  • Subscribers 144
  • Views 29623
  • Members are here 0
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Is there a function for mathematics constant PI?

richardyuan
what's the expression for π in cadence skill?
Parents
  • tweeks

    richardyuan said:
    It seems that defMathConstants() create an instance of a class, and the PI is a function of the created instance.

    No.  Look at the doc:

     

    defMathConstants( 
s_id 
) 
=> s_id
 
Associates a set of predefined math constants as properties of
the given symbol.

    If you try it interactively, you can see no classes are being instantiated here. 

    > defMathConstants('Math)
Math
> Math.?
(SHRT_MAX SHRT_MIN INT_MAX INT_MIN DBL_MAX
    DBL_MIN E LOG2E LOG10E LN2
    LN10 PI PI_OVER_2 PI_OVER_4 ONE_OVER_PI
    TWO_OVER_PI TWO_OVER_SQRTPI SQRT_TWO SQRT_POINT_FIVE
)
> classOf(Math)
*Error* eval: unbound variable - Math

    What's happening is that "PI" (and some other things) are being placed on the property list of the symbol Math. When you write "Math.PI", you are accessing the "PI" property on Math's property list. This has nothing whatsoever to do with classes and instances.

Reply
  • tweeks

    richardyuan said:
    It seems that defMathConstants() create an instance of a class, and the PI is a function of the created instance.

    No.  Look at the doc:

     

    defMathConstants( 
s_id 
) 
=> s_id
 
Associates a set of predefined math constants as properties of
the given symbol.

    If you try it interactively, you can see no classes are being instantiated here. 

    > defMathConstants('Math)
Math
> Math.?
(SHRT_MAX SHRT_MIN INT_MAX INT_MIN DBL_MAX
    DBL_MIN E LOG2E LOG10E LN2
    LN10 PI PI_OVER_2 PI_OVER_4 ONE_OVER_PI
    TWO_OVER_PI TWO_OVER_SQRTPI SQRT_TWO SQRT_POINT_FIVE
)
> classOf(Math)
*Error* eval: unbound variable - Math

    What's happening is that "PI" (and some other things) are being placed on the property list of the symbol Math. When you write "Math.PI", you are accessing the "PI" property on Math's property list. This has nothing whatsoever to do with classes and instances.

Children
No Data

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.