numpy.MachAr

class numpy.MachAr(float_conv=<type 'float'>, int_conv=<type 'int'>, float_to_float=<type 'float'>, float_to_str=<function <lambda> at 0xa443dbc>, 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)