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') [source]

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

[Re860718f5533-1]

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] 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)