ee.Number.digamma

  • The digamma() function calculates the digamma function of a given input number.

  • The input to the function is a number, and the output is the calculated digamma value, also a number.

  • Special cases like input values of -1 and 0 result in negative infinity as the output.

  • Examples demonstrate how the digamma() function can be used within both JavaScript and Python Earth Engine environments.

 Computes the digamma function of the input.

UsageReturns
Number.digamma()Number
ArgumentTypeDetails
this: inputNumberThe input value.

Examples

Code Editor (JavaScript)

print('Digamma for -1.5', ee.Number(-1.5).digamma());  // 0.703156637
print('Digamma for -1', ee.Number(-1).digamma());  // -Infinity
print('Digamma for 0', ee.Number(0).digamma());  // -Infinity
print('Digamma for 0.5', ee.Number(0.5).digamma());  // -1.963510028
print('Digamma for 1', ee.Number(1).digamma());  // -0.577215667
print('Digamma for 100', ee.Number(100).digamma());  // 4.600161852
print('Digamma for 1e13', ee.Number(1e13).digamma());  // 29.933606208

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)

print('Digamma for -1.5:', ee.Number(-1.5).digamma().getInfo())  # 0.703156637
print('Digamma for -1:', ee.Number(-1).digamma().getInfo())  # -Infinity
print('Digamma for 0:', ee.Number(0).digamma().getInfo())  # -Infinity
print('Digamma for 0.5:', ee.Number(0.5).digamma().getInfo())  # -1.963510028
print('Digamma for 1:', ee.Number(1).digamma().getInfo())  # -0.577215667
print('Digamma for 100:', ee.Number(100).digamma().getInfo())  # 4.600161852
print('Digamma for 1e13:', ee.Number(1e13).digamma().getInfo())  # 29.933606208