In my research work, I got some experiment data, and
from the theorical ayalysis I believe that these data
fit an emprical formula which has a form as:
f(x,y)=cos(arctg(a*x**b+c*(x*y)**d))*exp(-e*(x**g)*(y**h))
where a,b,c,d,e,g,h are the parameters that should be determined,
and x>=0, y>=0, 0<=f(x,y)<=1.
I tried to do the regression analysis using some softwares,
such as GRAFTOOL, Matlab, Math CAD, while the form of the
above regression formula is too complicated to be analyzed
using these softwares.
I am writing to inqury if anyone have a computer program
suitable for my problem, and any other relative information
is also appreciated.
I am looking forward to receiving your early reply.
Sincerely yours
Yang Qingshan