# Gaussian math problem

1. Mar 23, 2014

### aaaa202

For a gaussian of the form:

exp(-ax2)

How is a related to the width of the graph? I can see that if I compare with a normal distribution

a = 1/2σ2. Is that correct?

2. Mar 23, 2014

### HallsofIvy

What do you mean by "width" of the graph? Where are you measuring the "width"? Between x= -1 and x= 1 the width is $e^{-a^2}$. As for "$a= 1/2\sigma^2$", that makes no sense because there is no "$\sigma$" in the original function.