numpy.MachAr — NumPy v1.11 Manual (original) (raw)
class numpy.MachAr(float_conv=<type 'float'>, int_conv=<type 'int'>, float_to_float=<type 'float'>, float_to_str=<function at 0x49c2ce2c>, 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 islambda v:'%24.16e' %v. title : str, optional Title that is printed in the string representation of MachAr. |
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See also
Machine limits for floating point types.
Machine limits for integer types.
References
| [R1] | Press, Teukolsky, Vetterling and Flannery, “Numerical Recipes in C++,” 2nd ed, Cambridge University Press, 2002, p. 31. |
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Attributes
| ibeta | (int) Radix in which numbers are represented. |
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| 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) |