hypotenuse {learningr} | R Documentation |
Calculate the (Pythagorean) hypotenuse of two numeric vectors using the obvious algorithm.
hypotenuse(x, y)
x |
A numeric vector. |
y |
A numeric vector. |
A numeric vector of the hyptenuse of the inputs.
This algorithm fails when the inputs are very large of very small, making it unsuitable for real-world use.
Cleve Moler (MATLAB creator and discoverer of the Moler-Morrison algorithm for calculating hypotenuses) discusses the pro and cons of several algorithms here. http://blogs.mathworks.com/cleve/2012/07/30/pythagorean-addition
hypotenuse(5, 12) #okay
hypotenuse(1e-300, 1e-300) #fails
hypotenuse(1e300, 1e300) #fails