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Re: Help with creating a function
Posted:
Nov 18, 2013 6:38 AM


In message <ugnj89poilcj8f2uot0qjhqnk8um0dhmjp@4ax.com>, quasi <quasi@null.set> writes >Robert Crandal wrote: >> >>Suppose I have the following XY data set: >> >>X Y >>  >>0 1 >>1 1 >>2 2 >>3 3 >>. . >>. . >>N N >> >>Can this be represented with a math function? >> >>(Only consider positive integers >= 0) > >It's already a function since for each x in the domain, there >is a unique y. > >Presumably you want a "formula". > >The function f defined on the set of nonnegative integers >by the formula > > f(x) = ((x1)*(((2*x1)/abs(2*x1))+1)/2)+1 > >is not pretty but it works.
Given the storm in a teacup going on in another thread at the moment, this springs to mind.
f(x) = x + 0^x
Using of course the convention that 0^0 = 1 but 0^n = 0 for positive integers n.  David Hartley



