http://www.mathworks.com/matlabcentral/fileexchange/14590-measuring-soil-resistivity-for-grounding-systems

Hi Hana

I can not find my answer from this. Do you have any file for help me?

Thanks

if you want to do it by yourself in Matlab, I think it would be helpful to have a look at the Fortran code developed by David M. Boore. Here is the webpage of Dr. Boore .http://www.daveboore.com/

 you can find all his publications and software he developed in seismology on his web page..

You can also have a look at the files of SHAKE software which is used for linear and equivalent non-linear site effects.

hope it helps..

Shahid

Houman, did you try fitting with a custom equation? It seems you have an equation in literature that can be used to calculate your response.