如果运算数为零将返回 Decimal('-Infinity') 并且产生 the DivisionByZero 标志。如果运算数是无限大则返回 Decimal('Infinity') 。logical_and(other,context=None)logical_and() 是需要两个逻辑运算数的逻辑运算(参考 逻辑操作数 )。结果是按位输出的两运算数的 “和”。logical_invert(context=None)logical_in...
logb([context]):对非 0 对象,返回一个 Decimal 对象,值为调整后的指数。若为 0,则返回 Decimal('-Infinity'),同时 DivisionByZero 标志被激活 next_minus([context]),next_plus([context]),next_toward(other[, context]):分别返回在特定 context 下,最大的不超过对象的值,最小的超过对象的值,最接近的...
minusInfinity = NP("logical_and", infinite, NP(x <0.0)) x[infinite] = self.outerYPlusInfinity x[minusInfinity] = self.outerYMinusInfinityelse:ifx == float("inf"): x = self.outerYPlusInfinityelifx == float("-inf"): x = self.outerYMinusInfinityifisinstance(y, NP.ndarray): infinite...
p3 = MINUS_INFINITY_SENTENCE_LOG_PROBtry: p2 = bigrams[trigram[1:3]]exceptKeyError: p2 = MINUS_INFINITY_SENTENCE_LOG_PROBtry: p1 = unigrams[trigram[2]]exceptKeyError: p1 = MINUS_INFINITY_SENTENCE_LOG_PROB interpolated_score += math.log(lambda_ * (2** p3) + lambda_ * (2** p2) +...
(values are rounded to the closest multiple of 10 to the power minus ndigits; if two multiples are equally close, rounding is done toward the even choice) 同时,float类型采用双精度二进制存储(参照IEEE754标准),在表示十进制数值时会产生舍入,round函数针对十进制处理舍入,其中会产生一些计算中的诡异...
1) ROUND_CEILING 向正无穷(Infinity)靠近 代码语言:txt 复制 >>> tc.rounding = decimal.ROUND_CEILING >>> tc.create_decimal(‘1.12345’) Decimal('1.1235') # 正数时靠近较大方向 >>> tc.create_decimal(‘-1.12345’) Decimal('-1.1234') # 负数时靠近绝对值较小方向 ...
看起来np.log(x + 1)只在数组中x为255的地方给出-Inf。因为数组x是uint8，所以将1加到255会导致...
sign ::="+"|"-"infinity ::="Infinity"|"inf"nan ::="nan"numeric_value ::= floatnumber | infinity |nan numeric_string ::= [sign] numeric_value Here floatnumber is the form of a Python floating-point literal, described in Floating point literals. Case is not significant, so, for exa...
ascii(object) Asrepr(), return a string containing a printable representation of an object, but escape the non-ASCII characters in the string returned byrepr()using \x, \u or \U escapes. This generates a string similar to that returned byrepr()in Python 2. ...
看起来np.log(x + 1)只在数组中x为255的地方给出-Inf。因为数组x是uint8，所以将1加到255会导致...