Rounding with an ndigits argument also returns an integer."""passdef__rpow__(self, *args, **kwargs):#real signature unknown"""Return pow(value, self, mod)."""passdef__rrshift__(self, *args, **kwargs):#real signature unknown"""Return value>>self."""passdef__rshift__(self, *a...
计算最大值:amax(a, axis=None, out=None, keepdims=False) 。Return the maximum of an array or maximum along an axis. 计算加权平均值:np.average(a,b),其中b是权重 计算数组的极差:np.pth(a)=max(a)-min(a) 计算方差(总体方差):np.var(a) 标准差:np.std(a) 算术平方根,a为浮点数类型:np...
| Extends this array with datafromthe unicode string ustr.| The array must be a type'u'array; otherwise a ValueError|israised. Use array.fromstring(ustr.decode(...)) to|append Unicode data to an array of some other type.| |index(...)|index(x)| | Return index of first occurrence ...
append() -- append a new item to the end of the array buffer_info() -- return information giving the current memory info byteswap() -- byteswap all the items of the array count() -- return number of occurrences of an object extend() -- extend array by appending multiple elements from...
a=np.array([0,1,2,3,4]) b=np.array([9,8,7,6,5]) c=a**2+b**3 return c print(nusum()) 1. 2. 3. 4. 5. 6. 7. 8. 执行结果 [729 513 347 225 141] 1. 可以看到执行结果也是一个数组 numpy引入数组的好处是显而易见的: ...
尽管yield和return都能从函数中产出值,它们的本质却大不相同。return用于结束函数执行并返回一个值 ,而yield则用于生成器中,每次调用时临时返回一个值并保持函数的状态 ,等待下一次调用继续执行。 2.2 yield生成器的创建与调用 2.2.1 创建生成器函数 要创建一个生成器,只需在函数中至少包含一个yield语句。当调用这...
Returnanewarrayof given shapeandtype, without initializing entries. for i in range(8): arr[i] = i Return an object that produces a sequence of integers from start (inclusive) to stop (exclusive) by step. 为了以特定顺序选取行的子集,只需传入一个用于指定顺序的整数列表或ndarray,使用负数索引会...
returnz_score 3. boxplot 箱线图时基于四分位距(IQR)找异常点的。 图2: boxplot defboxplot(s): q1, q3 = s.quantile(.25), s.quantile(.75) iqr = q3 - q1 lower, upper = q1 -1.5*iqr, q3 +1.5*iqr returnlower, upper 4. ...
(x):return(1- (e ** (-2* x))) / (2* (e ** -x))defcosh(x):return(1+ (e ** (-2* x))) / (2* (e ** -x))deftanh(x):tanh_x = sinh(x) / cosh(x)returntanh_xdeftest(fn, name):start = perf_counter() result = fn(DATA) duration = perf_counter() - start ...
v_dq = np.array([v_alpha, v_beta]) theta = np.pi / 4 # 电机转子角度 rotation_matrix = np.array([[np.cos(theta), np.sin(theta)], [-np.sin(theta), np.cos(theta)]]) v_abc = np.dot(rotation_matrix, v_dq) return v_abc ...