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# numpy.MachAr

class `numpy.``MachAr`(float_conv=<type 'float'>, int_conv=<type 'int'>, float_to_float=<type 'float'>, float_to_str=<function <lambda> at 0x2ce8140>, 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

  [R1] | 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, substracted 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] usable floating value).
  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 | Same as xmin.
  huge | float | Same as xmax.
  precision | float | `- int(-log10(eps))`
  resolution | float | `- 10**(-precision)`

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