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Is there a function for mathematics constant PI?

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

    Thanks for the insights, Andrew.  From your explanation, I can see why the GDM API works as it does.  It sounds like, from a C programmer's point of view, it seems quite natural.

    I'm very curious as to the history of defMathConstants.  In Common Lisp and Emacs Lisp, those constants are simply bound to the value slots of certain symbols: pi, most-positive-fixnum, etc.  I couldn't find any mention of math constants in my Franz Lisp literature, so it seems to be something added by the SKILL developers, but I would like to know why they chose to use symbol property lists over the usual Common Lisp and Emacs Lisp conventions.  Maybe since the math constants ultimately are from C's math.h, it was easier to expose them to SKILL through property lists than by binding individual variables?

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  • tweeks

    Thanks for the insights, Andrew.  From your explanation, I can see why the GDM API works as it does.  It sounds like, from a C programmer's point of view, it seems quite natural.

    I'm very curious as to the history of defMathConstants.  In Common Lisp and Emacs Lisp, those constants are simply bound to the value slots of certain symbols: pi, most-positive-fixnum, etc.  I couldn't find any mention of math constants in my Franz Lisp literature, so it seems to be something added by the SKILL developers, but I would like to know why they chose to use symbol property lists over the usual Common Lisp and Emacs Lisp conventions.  Maybe since the math constants ultimately are from C's math.h, it was easier to expose them to SKILL through property lists than by binding individual variables?

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