Hi,(adsbygoogle = window.adsbygoogle || []).push({});

I need help with the gaussian function in 3D. I'm using the form:

z=A*exp( (x-xo)^2/(2σx^2)+(y-yo)^2/(2σy^2))

I know that A is the amplitude and xo,yo are the center coordinate.

I found that formula on http://en.wikipedia.org/wiki/Gaussian_function and they say that σx and σy are the spread of the blob. But if I put σx=σy=1, the function is from -3 to 3... Why is that ?

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Help with the 3D gaussian function

**Physics Forums | Science Articles, Homework Help, Discussion**