ee.Array.accum

通过将结果的每个元素设置为沿相应轴的元素（包括当前位置）的缩减值，沿给定轴累积数组的元素。可用于生成累计和、单调递增序列等。

用法返回
Array.accum(axis, reducer)数组
参数类型详细信息
此：array数组要累积的数组。
axis整数执行累积的轴。
reducer缩减器，默认值：null用于累积值的 reducer。默认值为 SUM，用于生成每个向量沿指定轴的累计和。

示例

代码编辑器 (JavaScript)

print(ee.Array([-1]).accum(0));  // [-1]
print(ee.Array([-2, 1]).accum(0));  // [-2, -1]
print(ee.Array([-2, 1, 9]).accum(0));  // [-2, -1, 8]

// accum over 2D arrays with different axes.
print(ee.Array([[1, 3], [5, 7]]).accum(0));  // [[1,3],[6,10]]
print(ee.Array([[1, 3], [5, 7]]).accum(1));  // [[1,4],[5,12]]

// sum is the default reducer.
print(ee.Array([2, -2, 3, 1]).accum(0));  // [2,0,3,4]
print(ee.Array([2, -2, 3, 1]).accum(0, ee.Reducer.sum()));  // [2,0,3,4]

// Some example reducers.
print(ee.Array([2, -2, 3, 1]).accum(0, ee.Reducer.max()));  // [2,2,3,3]
print(ee.Array([2, -2, 3, 1]).accum(0, ee.Reducer.mean()));  // [2,0,1,1]
print(ee.Array([2, -2, 3, 1]).accum(0, ee.Reducer.min()));  // [2,-2,-2,-2]
print(ee.Array([2, -2, 3]).accum(0, ee.Reducer.product()));  // [2,-4,-12]

Python 设置

如需了解 Python API 和如何使用 geemap 进行交互式开发，请参阅 Python 环境页面。

import ee
import geemap.core as geemap

Colab (Python)

display(ee.Array([-1]).accum(0))  # [-1]
display(ee.Array([-2, 1]).accum(0))  # [-2, -1]
display(ee.Array([-2, 1, 9]).accum(0))  # [-2, -1, 8]

# accum over 2D arrays with different axes.
display(ee.Array([[1, 3], [5, 7]]).accum(0))  # [[1, 3],[6, 10]]
display(ee.Array([[1, 3], [5, 7]]).accum(1))  # [[1, 4],[5, 12]]

# sum is the default reducer.
display(ee.Array([2, -2, 3, 1]).accum(0))  # [2, 0, 3, 4]

# [2, 0, 3, 4]
display(ee.Array([2, -2, 3, 1]).accum(0, ee.Reducer.sum()))


# Some example reducers.
# [2, 2, 3, 3]
display(ee.Array([2, -2, 3, 1]).accum(0, ee.Reducer.max()))


# [2, 0, 1, 1]
display(ee.Array([2, -2, 3, 1]).accum(0, ee.Reducer.mean()))

# [2, -2, -2, -2]
display(ee.Array([2, -2, 3, 1]).accum(0, ee.Reducer.min()))

# [2, -4, -12]
display(ee.Array([2, -2, 3]).accum(0, ee.Reducer.product()))