#创建一维数组a = np.array([1, 2, 3, 4, 5])print(a)print(type(a))"""[1 2 3 4 5] <class 'numpy.ndarray'>""" - 创建二维数据: #创建二维数组a2 = np.array([[1, 2, 3], [4, 5, 6]])print(a2)print(type(a2))"""[[1 2 3] [4 5 6]] <c
array1 = np.array([0.12,0.17,0.24,0.29])array2 = np.array([0.13,0.19,0.26,0.31])# with a tolerance of 0.1, it should return False:np.allclose(array1,array2,0.1)False# with a tolerance of 0.2, it should return True:np.allclose(array1,array...
np.sumnp.nansumComputesumofelements np.prodnp.nanprodComputeproductofelements np.meannp.nanmeanComputemeanofelements np.stdnp.nanstdComputestandarddeviation np.varnp.nanvarComputevariance np.minnp.nanminFindminimumvalue np.maxnp.nanmaxFindmaximumvalue np.argminnp.nanargminFindindexofminimumvalue np.arg...
max(iterable, *[, default=obj, key=func]) -> valuemax(arg1, arg2, *args, *[, key=func]) -> valueWith a single iterable argument, return its biggest item. Thedefault keyword-only argument specifies an object to return ifthe provided iterable is empty.With two or more arguments, retur...
[-0.28790332, -0.96139749, -0.75098725, 0.14987721]]) >>> # index of the maxima for each series >>> ind = data.argmax(axis=0) >>> ind array([2, 0, 3, 1]) >>> # times corresponding to the maxima >>> time_max = time[ind] >>> >>> data_max = data[ind, range(data....
* 尝试分配更大的数组可能会导致OutOfMemoryError */ private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8; 1. 2. 3. 4. 5. 6. ArrayList(int initialCapacity) 初始化自定义大小空间的列表。 ArrayList(Collection<? extends E> c) ...
1. 使用np.array() 参数为列表: 如[1, 4, 2, 5, 3] arr1=np.array([1,2,3,4]) arr1 #点击shift + Enter后可直接查看数组 1 2 1.1 查看变量的数据类型 type(arr1) 输出:numpy.ndarray 1 2 1.2 创建二维数组 arr2= np.array([[1,2,3],[4,5,6],[7,8,9]]) ...
Swap the bytes of the array elements choose(choices[, out, mode]) Use an index array to construct a new array from a set of choices. clip([min, max, out]) Return an array whose values are limited to [min, max]. compress(condition[, axis, out]) Return selected slices of this arra...
(tfidf, idxs, 1) # 返回tfidf矩阵 return tfidf # 定义一个名为 Vocabulary 的类 class Vocabulary: # 初始化方法,设置类的属性 def __init__( self, lowercase=True, # 是否将单词转换为小写,默认为True min_count=None, # 单词最小出现次数,默认为None max_tokens=None, # 最大单词数量,默认为...
from sklearn import datasets %matplotlib inline import matplotlib.pyplot as plt ## Boston House Prices dataset boston = datasets.load_boston() x = boston.data y = boston.target boston.feature_names array(['CRIM', 'ZN', 'INDUS', 'CHAS', 'NOX', 'RM', 'AGE', 'DIS', 'RAD', 'TAX'...