AI-generated Key Takeaways
-
The
accummethod accumulates elements of an array along a specified axis, resulting in a new array where each element is the reduction of elements up to that position. -
This method can be used to calculate a cumulative sum or generate a monotonically increasing sequence.
-
The
accummethod takes the axis and an optional reducer as arguments, and returns an array. -
The default reducer for
accumis SUM, which computes the cumulative sum. -
Different reducers like MAX, MEAN, MIN, and PRODUCT can also be used with the
accummethod to perform various cumulative operations.
| Usage | Returns |
|---|---|
Array.
accum
(axis, reducer
)
|
Array |
| Argument | Type | Details |
|---|---|---|
|
this:
array
|
Array | Array to accumulate. |
axis
|
Integer | Axis along which to perform the accumulation. |
reducer
|
Reducer, default: null | Reducer to accumulate values. Default is SUM, to produce the cumulative sum of each vector along the given axis. |
Examples
Code Editor (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]
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 ()))
