numpy.finfo

class numpy.finfo

Machine limits for floating point types.

Parameters :

dtype : floating point type, dtype, or instance

The kind of floating point data type to get information about.

See also

MachAr
The implementation of the tests that produce this information.
iinfo
The equivalent for integer data types.

Notes

For developers of NumPy: do not instantiate this at the module level. The initial calculation of these parameters is expensive and negatively impacts import times. These objects are cached, so calling finfo() repeatedly inside your functions is not a problem.

Attributes

eps floating point number of the appropriate type The smallest representable number such that 1.0 + eps != 1.0.
epsneg floating point number of the appropriate type The smallest representable number such that 1.0 - epsneg != 1.0.
iexp int The number of bits in the exponent portion of the floating point representation.
machar MachAr The object which calculated these parameters and holds more detailed information.
machep int The exponent that yields eps.
max floating point number of the appropriate type The largest representable number.
maxexp int The smallest positive power of the base (2) that causes overflow.
min floating point number of the appropriate type The smallest representable number, typically -max.
minexp int The most negative power of the base (2) consistent with there being no leading 0’s in the mantissa.
negep int The exponent that yields epsneg.
nexp int The number of bits in the exponent including its sign and bias.
nmant int The number of bits in the mantissa.
precision int The approximate number of decimal digits to which this kind of float is precise.
resolution floating point number of the appropriate type The approximate decimal resolution of this type, i.e. 10**-precision.
tiny floating point number of the appropriate type The smallest-magnitude usable number.

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