3D Gaussian Decay from 1 to 0
3 views (last 30 days)
Show older comments
Inês Rodrigues
on 26 May 2015
Commented: Inês Rodrigues
on 26 May 2015
I'm doing a model in matlab and I want that, when my variable k is 1, it decays to 0 by a gaussian pattern. It's a 3D model, so the maximum 1 would decay in every direction. The result would be a matrix with the ones k gave me and the other elements between 0 and 1. Could you please help me?
0 Comments
Accepted Answer
Image Analyst
on 26 May 2015
Edited: Image Analyst
on 26 May 2015
If you have the Image Processing Toolbox, you can use fspecial(). Of course since it's Gaussian, it will decay towards zero, not to zero. Gaussians can never equal zero.
If you don't have that toolbox, just use meshgrid() and exp() to create the Gaussian pattern. In fact, this might be easier for the 3D case since with fspecial, it just creates a 2D Gaussian so you'd have to call it repeatedly to get the third dimension of a 3D Gaussian "ball".
3 Comments
Image Analyst
on 26 May 2015
Of course, just use x - xCenter. The usual offset formula like for all mathematical formula like you're used to. But you're not creating a 3D matrix, you're creating a 2D one. Just look - 2 indexes. That means it's 2D. If it were 3D, you'd have to have 3 indexes, one for x, one for y, and one for z.
More Answers (0)
See Also
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!