Hi , I would need to translate this from matlab to excel....however I do not know the syntax for that I tried to replicate that with nlbmin...however how should i specify additional arguments ?. for now i Have..as this might be sufficient for me.However I get objective NaN in result/ nlminb(start=c(-0.0073,0.00096),objective=function,x=x,y=y,t=t,b=b[i]) and how to do feval and following ....or Actuallly how to do it. Matlab code for i=1:B; [param, feval(i)] = fminsearch(@(par) ..function(x,y,z)... r(i) = param(1); v(i) = param(2); end Thanks for a help since I am still a novice... -- View this message in context: http://r.789695.n4.nabble.com/Help-with-nlminb-and-matlab-translation-tp3241700p3241700.html Sent from the R help mailing list archive at Nabble.com.