numpy.diff¶
-
numpy.
diff
(a, n=1, axis=-1)[source]¶ 计算沿给定轴的第n个离散差分。
The first difference is given by
out[n] = a[n+1] - a[n]
along the given axis, higher differences are calculated by usingdiff
recursively.参数: a:array_like
输入数组
- n : int,可选
差值的次数。
- 轴 : int,可选
采用差值的轴,默认值为最后一个轴。
返回: diff:ndarray
第n个差异。除了轴,输出形状与a相同,其中尺寸小于n。
。
例子
>>> x = np.array([1, 2, 4, 7, 0]) >>> np.diff(x) array([ 1, 2, 3, -7]) >>> np.diff(x, n=2) array([ 1, 1, -10])
>>> x = np.array([[1, 3, 6, 10], [0, 5, 6, 8]]) >>> np.diff(x) array([[2, 3, 4], [5, 1, 2]]) >>> np.diff(x, axis=0) array([[-1, 2, 0, -2]])