Constants

NLCPy includes several constants:

nlcpy.inf

IEEE 754 floating point representation of positive infinity.

Returns

yfloat: A floating point representation of positive infinity.

参考

isinf isnan isfinite

注釈

NLCPy uses the IEEE Standard for Binary Floating-Point for Arithmetic (IEEE 754). This means that Not a Number is not equivalent to infinity. Also that positive infinity is not equivalent to negative infinity. But infinity is equivalent to positive infinity.

Inf, Infinity, PINF and infty are aliases for inf.

nlcpy.Inf

IEEE 754 floating point representation of positive infinity.

Use inf because Inf, Infinity, PINF and infty are aliases for inf. For more details, see inf.

参考

inf

nlcpy.Infinity

IEEE 754 floating point representation of positive infinity.

Use inf because Inf, Infinity, PINF and infty are aliases for inf. For more details, see inf.

参考

inf

nlcpy.PINF

IEEE 754 floating point representation of positive infinity.

Use inf because Inf, Infinity, PINF and infty are aliases for inf. For more details, see inf.

参考

inf

nlcpy.infty

IEEE 754 floating point representation of positive infinity.

Use inf because Inf, Infinity, PINF and infty are aliases for inf. For more details, see inf.

参考

inf

nlcpy.NINF

IEEE 754 floating point representation of negative infinity.

Returns

yfloat: A floating point representation of negative infinity.

参考

isinf isnan isfinite

注釈

NLCPy uses the IEEE Standard for Binary Floating-Point for Arithmetic (IEEE 754). This means that Not a Number is not equivalent to infinity. Also that positive infinity is not equivalent to negative infinity. But infinity is equivalent to positive infinity.

nlcpy.nan

IEEE 754 floating point representation of Not a Number (NaN).

Returns

yfloat: A floating point representation of Not a Number.

参考

isnan isfinite

注釈

NLCPy uses the IEEE Standard for Binary Floating-Point for Arithmetic (IEEE 754). This means that Not a Number is not equivalent to infinity. NaN and NAN are aliases of nan.

nlcpy.NAN

IEEE 754 floating point representation of Not a Number (NaN).

NaN and NAN are equivalent definitions of nan. Please use nan instead of NAN.

参考

nan

nlcpy.NaN

IEEE 754 floating point representation of Not a Number (NaN).

NaN and NAN are equivalent definitions of nan. Please use nan instead of NaN.

参考

nan

nlcpy.NZERO

IEEE 754 floating point representation of negative zero.

Returns

yfloat: A floating point representation of negative zero.

参考

PZERO isinf isnan isfinite

注釈

NLCPy uses the IEEE Standard for Binary Floating-Point for Arithmetic (IEEE 754). Negative zero is considered to be a finite number.

Examples

>>> import nlcpy as vp
>>> vp.NZERO
-0.0
>>> vp.PZERO
0.0

>>> vp.isfinite([vp.NZERO])
array([ True])
>>> vp.isnan([vp.NZERO])
array([False])
>>> vp.isinf([vp.NZERO])
array([False])

nlcpy.PZERO

IEEE 754 floating point representation of positive zero.

Returns

yfloat: A floating point representation of positive zero.

参考

NZERO isinf isnan isfinite

注釈

NLCPy uses the IEEE Standard for Binary Floating-Point for Arithmetic (IEEE 754). Positive zero is considered to be a finite number.

Examples

>>> import nlcpy as vp
>>> vp.PZERO
0.0
>>> vp.NZERO
-0.0

>>> vp.isfinite([vp.PZERO])
array([ True])
>>> vp.isnan([vp.PZERO])
array([False])
>>> vp.isinf([vp.NZERO])
array([False])

nlcpy.e

Euler's constant, base of natural logarithms, Napier's constant.

e = 2.71828182845904523536028747135266249775724709369995...

参考

exp log

nlcpy.euler_gamma: γ = 0.5772156649015328606065120900824024310421...

nlcpy.pi: pi = 3.1415926535897932384626433...