Dear Rooters, my problem is this: I have a class Deco that has the method ZTrueConvolve() it performs the convolution of some data, by "gaussianiously" smearing each entries. Id est: For each entry (in my case the Z of a nucleous) a normalization factor is computed and then, since the sigma_Z is the same for all the entry, always inside ZTrueConvolve(), a function is called that takes into consideration as many as the entries and sums up all the relative gaussians, returning the final function (clearly a multi gaussian summation) fgaus. Always inside ZTrueConvolve there is then the command fgaus->Draw(option) where option could be specified by the user. The class is attached, but a very rough sketch is the following: Class Deco(...) ... double zfunc7(Double_t *x, Double_t *par) { double fitval=0; int i=2; int limite = par[0]+2; while(i<limite) { fitval += par[i]*TMath::Exp(-TMath::pow(x[0]-i-par[1]+2,2) /(2*TMath::pow(Deco::ZRes(),2))); i++; } return fitval; } //^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ //this is the function void Deco::ZTrueConvolve(char* option, int nvb) // option is the Draw option (i.g. "same") // nvb is the index for 3 types of final functions { ... // some declarations etc... TF1 *fgaus= new TF1("zfunc7",zfunc7,_zmin,_zmax,limite); // set the parameters for the function fgaus->SetParameter(0,nozbin); fgaus->SetParameter(1,_zmin); int iset=0; while(iset<nozbin){ norm=A(iset) // get the normalization factor fgaus->SetParameter(iset+2,norm); iset++; } fgaus->Print(); fgaus->SetTitle(); fgaus->Draw(option); //end ZTrueConvolve } //^^^^^^^^^^^^^^^^^^^^^^^^^^^ // this is the method Well, the problem is that I cannot superimpose different plot, since if I do (et assume that "da" is the object of class Deco) da.ZTrueConvolve("",1); da.ZTrueConvolve("same",2); the first plot disappears and the second is plot without the frame. Where I miss the ownership? I try to add the line fgaus->SetDirectory(0); after I "->Draw()"ed it... but it seems not to work wit my Root Version (3.00) Thanks Tommaso
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