I'm in great need for such. PLease tell if such scripts are available?
I know a lot have been done on Matlab - will I have to buy that instead?

If no one can supply you with this script, and you are a C programmer, you could use the documentation and samples that come with the Origin Professional package to write a DLL that can be called from Origin. For ideas on coding, you could check out Numerical Recipes in C, which is available online at http://www.nr.com/. More information on Origin Professional is available at http://www.microcal.com/www/modules/orgpro.asp.