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ee.Array.dotProduct

Page Summary

Computes the dot product of two 1-D arrays.
Takes two arrays as input and returns a single number.

Compute the dot product between two 1-D arrays.

Usage	Returns
`Array. dotProduct (array2)`	Number

Argument	Type	Details
this: `array1`	Array	The first 1-D array.
`array2`	Array	The second 1-D array.

Examples

Code Editor (JavaScript)

 print 
 ( 
 ee 
 . 
 Array 
 ([ 
 1 
 ]). 
 dotProduct 
 ( 
 ee 
 . 
 Array 
 ([ 
 2 
 ]))); 
  
 // 2 
 print 
 ( 
 ee 
 . 
 Array 
 ([ 
 1 
 , 
  
 2 
 ]). 
 dotProduct 
 ( 
 ee 
 . 
 Array 
 ([ 
 3 
 , 
  
 4 
 ]))); 
  
 // 1*3 + 2*4 = 11 
 print 
 ( 
 ee 
 . 
 Array 
 ([ 
 0 
 , 
  
 1 
 , 
  
 2 
 ]). 
 dotProduct 
 ( 
 ee 
 . 
 Array 
 ([ 
 3 
 , 
  
 4 
 , 
  
 5 
 ]))); 
  
 // 0*3 + 1*4 + 2*5 = 14 
 print 
 ( 
 ee 
 . 
 Array 
 ([ 
 - 
 1 
 , 
  
 - 
 2 
 ]). 
 dotProduct 
 ( 
 ee 
 . 
 Array 
 ([ 
 3 
 , 
  
 4 
 ]))); 
  
 // -1*3 + -2*4 = -11 
 print 
 ( 
 ee 
 . 
 Array 
 ([ 
 1.5 
 , 
  
 2.5 
 ]). 
 dotProduct 
 ( 
 ee 
 . 
 Array 
 ([ 
 3 
 , 
  
 4 
 ]))); 
  
 // 1.5*3 + 2.5*4 = 14.5

Python setup

See the Python Environment page for information on the Python API and using geemap for interactive development.

 import 
  
 ee 
 import 
  
 geemap.core 
  
 as 
  
 geemap

Colab (Python)

 display 
 ( 
 ee 
 . 
 Array 
 ([ 
 1 
 ]) 
 . 
 dotProduct 
 ( 
 ee 
 . 
 Array 
 ([ 
 2 
 ]))) 
 # 2 
 display 
 ( 
 ee 
 . 
 Array 
 ([ 
 1 
 , 
 2 
 ]) 
 . 
 dotProduct 
 ( 
 ee 
 . 
 Array 
 ([ 
 3 
 , 
 4 
 ]))) 
 # 1*3 + 2*4 = 11 
 display 
 ( 
 ee 
 . 
 Array 
 ([ 
 0 
 , 
 1 
 , 
 2 
 ]) 
 . 
 dotProduct 
 ( 
 ee 
 . 
 Array 
 ([ 
 3 
 , 
 4 
 , 
 5 
 ]))) 
 # 0*3 + 1*4 + 2*5 = 14 
 display 
 ( 
 ee 
 . 
 Array 
 ([ 
 - 
 1 
 , 
 - 
 2 
 ]) 
 . 
 dotProduct 
 ( 
 ee 
 . 
 Array 
 ([ 
 3 
 , 
 4 
 ]))) 
 # -1*3 + -2*4 = -11 
 display 
 ( 
 ee 
 . 
 Array 
 ([ 
 1.5 
 , 
 2.5 
 ]) 
 . 
 dotProduct 
 ( 
 ee 
 . 
 Array 
 ([ 
 3 
 , 
 4 
 ]))) 
 # 1.5*3 + 2.5*4 = 14.5

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Page Summary

Examples

Code Editor (JavaScript)

Colab (Python)

ee.Array.dotProduct