Difference between Sigmoid and Sigmoidal

What is the difference between Sigmoid and Sigmoidal?

Sigmoid as an adjective is curved in two directions, like the letter "s", or the greek ς (sigma). while Sigmoidal as an adjective is characterized by a sigmoid curve or function

Sigmoid

Part of speech: adjective

Definition: Curved in two directions, like the letter "S", or the Greek ς (sigma). Semi-circular, like the lunar sigma (similar to English C). Relating to the sigmoid flexure of the large intestine.

Part of speech: noun

Definition: A function having a graph whose shape is sigmoid. See Wikipedia, [http://mathworld.wolfram.com/SigmoidFunction.html Mathworld].

Sigmoidal

Part of speech: adjective

Definition: Characterized by a sigmoid curve or function

We hope you now know whether to use Sigmoid or Sigmoidal in your sentence.

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