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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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  • Andrew Beckett

    defMathConstants() is what you want:

    > defMathConstants('MyConsts)
    MyConsts
    > MyConsts.?
    (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
    )
    > MyConsts.PI
    3.141593
    > printf("%.14f\n" MyConsts.PI)
    3.14159265358979
    t
    > sstatus(fullPrecision t)
    t
    > MyConsts.??
    (SQRT_POINT_FIVE 0.7071067811865476 SQRT_TWO 1.414213562373095 TWO_OVER_SQRTPI
        1.128379167095513 TWO_OVER_PI 0.6366197723675814 ONE_OVER_PI 0.3183098861837907
        PI_OVER_4 0.7853981633974483 PI_OVER_2 1.570796326794897 PI
        3.141592653589793 LN10 2.302585092994046 LN2 0.6931471805599453
        LOG10E 0.4342944819032518 LOG2E 1.442695040888963 E
        2.718281828459045 DBL_MIN 2.225073858507201e-308 DBL_MAX 1.797693134862316e+308
        INT_MIN -2147483648 INT_MAX 2147483647 SHRT_MIN
        -32768 SHRT_MAX 32767
    )

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    defMathConstants() is what you want:

    > defMathConstants('MyConsts)
    MyConsts
    > MyConsts.?
    (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
    )
    > MyConsts.PI
    3.141593
    > printf("%.14f\n" MyConsts.PI)
    3.14159265358979
    t
    > sstatus(fullPrecision t)
    t
    > MyConsts.??
    (SQRT_POINT_FIVE 0.7071067811865476 SQRT_TWO 1.414213562373095 TWO_OVER_SQRTPI
        1.128379167095513 TWO_OVER_PI 0.6366197723675814 ONE_OVER_PI 0.3183098861837907
        PI_OVER_4 0.7853981633974483 PI_OVER_2 1.570796326794897 PI
        3.141592653589793 LN10 2.302585092994046 LN2 0.6931471805599453
        LOG10E 0.4342944819032518 LOG2E 1.442695040888963 E
        2.718281828459045 DBL_MIN 2.225073858507201e-308 DBL_MAX 1.797693134862316e+308
        INT_MIN -2147483648 INT_MAX 2147483647 SHRT_MIN
        -32768 SHRT_MAX 32767
    )

    Regards,

    Andrew.

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