How do i fit parameters to multiple data set using an equation?

Dear all,

I have a question regarding the fitting of an equation to multiple data set for two parameters. My data is like:

t = [0,60,600,3600,10800];

x= [150,125,110,103,100];

x1=[150,118,108,102,98];

x2=[150,112,85,60,55];

The equation containing the parameter is

((195*(0.2)^0.06597)-a*log(1+b*x))

I need to find the single value of a and b that provide the best fit for t vs (x1, x2, x3)

Its a basic question but i am still a newbie. Many thanks in advance for your reposnses.

Regards,

[Cris LaPierre]

Do you have access to the curve fitting toolbox?

[fadzhi]

Many thanks for the comment. I have access to curve fitting tool box but there i can also take one data set not multiple. is it possible to take multiple data sets in curve fitting tool box?

Regards,

[Torsten]

Take

t = [0,60,600,3600,10800;0,60,600,3600,10800;0,60,600,3600,10800];
x = [150,125,110,103,100;150,118,108,102,98;150,112,85,60,55];

But I don't understand why there is no t in your equation containing the prarameters. Doesn't seem to make too much sense.