Equation for a growing and decaying exponential

I like know whether any single equation is there for a growing and decaying exponential .i.e from minus infinity to zero it has to grow up to one (at zero one) and from zero to + infinity it has to decay.(All most look like a triangle wave).whether any equation will do this or not . Thanks in advance .

Answer 1

[Star Strider]

You can easily create your own. Here is an anonymous function that works:

x = [-10:0.1:10];
k = 2.0;
f = @(x,k) exp(-abs(k*x));

figure(1)
plot(x, f(x,k))
grid

[John D'Errico]

As Star wrote it, k is a "rate" parameter, that defines how fast is the growth/decay. You can also think of k as the slope as x approaches 0 from below, or the negative of the slope just above zero.

[Star Strider]

Thank you John. I should have included an explanation of how it works. (Not fully awake here yet.)

[Abhishek sadasivan]

Thanks you very much

[Star Strider]

My pleasure.