Add "rss()" (root-sum-squared) function in JMP

[BHarris]

Recommend adding "rss()" (root-sum-squared) function in JMP.  This is very useful for calculating the magnitude of vectors, hypotenuse of 2-d and 3-d triangles, etc.

Basically it would take the square-root of the sum of the squared terms.

[Craige_Hales]

@BHarris  Agree. The Distance function is close, flexible, but not easy to use or explain.

v = [3 4];
distance(v,v*0)^.5;

[5]

I've used this

sqrt(sum([3 4]^2))

5

which is not immediately obvious either. Length and Abs are already in use with an array argument. I think Magnitude might be a better name than Rss.

Magnitude([1 2 3, 4 5 6]) should return a 2 row by 1 col matrix.

Magnitude(1,2,3) should return a scalar.

Or Hypotenuse.