Exponential function appearing linear....

I am trying to graph this function, for some reason I can't get it to appear exponential, no matter how much I play with the axes. Can someone tell me what I'm doing wrong?

Ic=10^(-14)*exp(Vbe./(26*10^(-3))); plot (Vbe, Ic)

Answer 1

[John D'Errico]

Well, since you don't tell us the range of Vbe (the dependent variable) you are looking at, what can I say?

The fact is, over a sufficiently small range, any well-behaved function will APPEAR essentially linear.

ezplot(@exp,[0,.1])

We know it is NOT truly linear. But as you would expect, over that range, the higher order terms in a Taylor series approximation are virtually irrelevant. Widen the range sufficiently, and no problem. It now looks as you might expect.

ezplot(@exp,[-1,1])