I need to define a function f(x) so that:

f(x) = 0, when x=0

=1, when x >0

while, x >=0 and integer only

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- August 25th 2005, 09:38 PMdjyotiproblem with defining a function
I need to define a function f(x) so that:

f(x) = 0, when x=0

=1, when x >0

while, x >=0 and integer only - August 25th 2005, 10:38 PMrgep
NWell, you have defined it! You've told us exactly what its domain of definition is, and what its value is for every element of the domain. Do you want a name for it (it's a

*step function*or*Heaviside function*or*sign function*or*signum*) or are you trying to express it as an algebraic formula of some kind? - August 29th 2005, 05:13 AMdjyotidefining th fn. as algebraic formula
I am trying to to express it as an algebraic formula . Can u please help me ?

- August 29th 2005, 07:23 AMrgep
Algebraic formulae tend to define continuous functions, and yours has a step discontinuity. I suppose you could say something like $\vert x \vert = \sqrt{x^2}$ and then write $\frac{d}{dx} \vert x \vert$ but that's rather dubious.