# numpy.MachAr

class numpy.MachAr(float_conv=<class 'float'>, int_conv=<class 'int'>, float_to_float=<class 'float'>, float_to_str=<function MachAr.<lambda>>, title='Python floating point number')

  Diagnosing machine parameters.

  Parameters
    float_conv function, optional

      Function that converts an integer or integer array to a float or float array. Default is `float`.

    int_conv function, optional

      Function that converts a float or float array to an integer or integer array. Default is `int`.

    float_to_float function, optional

      Function that converts a float array to float. Default is `float`. Note that this does not seem to do anything useful in the current implementation.

    float_to_str function, optional

      Function that converts a single float to a string. Default is `lambda v:'%24.16e' %v`.

    title str, optional

      Title that is printed in the string representation of `MachAr`.

  See also

  `finfo`

    Machine limits for floating point types.

  `iinfo`

    Machine limits for integer types.

  References

  1

    Press, Teukolsky, Vetterling and Flannery, “Numerical Recipes in C++,” 2nd ed, Cambridge University Press, 2002, p. 31.

  Attributes
    ibeta int

      Radix in which numbers are represented.

    it int

      Number of base-ibeta digits in the floating point mantissa M.

    machep int

      Exponent of the smallest (most negative) power of ibeta that, added to 1.0, gives something different from 1.0

    eps float

      Floating-point number `beta**machep` (floating point precision)

    negep int

      Exponent of the smallest power of ibeta that, subtracted from 1.0, gives something different from 1.0.

    epsneg float

      Floating-point number `beta**negep`.

    iexp int

      Number of bits in the exponent (including its sign and bias).

    minexp int

      Smallest (most negative) power of ibeta consistent with there being no leading zeros in the mantissa.

    xmin float

      Floating-point number `beta**minexp` (the smallest [in magnitude] positive floating point number with full precision).

    maxexp int

      Smallest (positive) power of ibeta that causes overflow.

    xmax float

      `(1-epsneg) * beta**maxexp` (the largest [in magnitude] usable floating value).

    irnd int

      In `range(6)`, information on what kind of rounding is done in addition, and on how underflow is handled.

    ngrd int

      Number of ‘guard digits’ used when truncating the product of two mantissas to fit the representation.

    epsilon float

      Same as eps.

    tiny float

      An alias for smallest_normal, kept for backwards compatibility.

    huge float

      Same as xmax.

    precision float

      `- int(-log10(eps))`

    resolution float

      `- 10**(-precision)`

    smallest_normal float

      The smallest positive floating point number with 1 as leading bit in the mantissa following IEEE-754. Same as xmin.

    smallest_subnormal float

      The smallest positive floating point number with 0 as leading bit in the mantissa following IEEE-754.

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