Gaussian help in Matlab

I have a two column matrix representing data points, the left column being the x-coordinate and the right being the y-coordinate.

I want to fit a Gaussian to my data, and find the standard deviation of the data and the x-coordinate of the peak of the Gaussian.

Any help would be appreciated - I've been searching the internet for a bit and have not been successful.

[Oleg Komarov]

Do you have the Stats Toolbox?

Answer 1

[Matt J]

There are many offerings

http://www.mathworks.com/matlabcentral/fileexchange/index?utf8=%E2%9C%93&term=Gauss+fit

Or you could make your own using FMINSEARCH.

[Matt J]

This one seems reasonably appropriate, and reasonably popular,

http://www.mathworks.com/matlabcentral/fileexchange/35122-gaussian-fit

Answer 2

[Shashank Prasanna]

What you want is directly available in the curve fitting toolbox: http://www.mathworks.com/help/curvefit/gaussian.html

However it seems like you want to fit a distribution because you specifically want the mean and standard deviation. You can go directly to the stats toolbox and use your data to fit the distribution. It will give you the mean and standard deviation: http://www.mathworks.com/help/stats/normal-distribution.html

If you don't have either of the toolboxes, go to wikipedia get the formula and implement it yourself using FMINSEARCH as Matt mentioned or you will most definitely find something in File Exchange.