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

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.