How to set a startpoint for Gaussian fitting?

Hi all, Is here any body can help me with the start point of Gaussian fitting?

Here is Gaussian equation.

y = a* exp(-((x-b)/c)^2)

for start fitting I need to set up the startpoints as follow:

a0 is the max value of the frequency in a histogram. b0 is the bin value corresponding to the a0 in histogram.

my question is how to set c0 for the starting point?

Thanks a lot in advance.

Zhongkui

Answer 1

[Shashank Prasanna]

Since these are starting point they could be anything. But it helps to be close.

Since c corresponds to the standard deviation of your data, you can give that as c0 to start with. Also you could make sure that c is constrained to be position.

>> c0 = std(data)

[Zhongkui]

Thanks Shashank. It helps.

[Shashank Prasanna]

please accept the answer if it helps you