Hi Henrique, you can use TObjArray of histograms. -best, Pasha "Henrique de M. J. Barbosa - mestrado" wrote: > > Dear Root Masters, > > I have the following problem: I want to build an array of histograms and > use this array as a parameter of a function. Well, if I fix the size of > the array before passing it to the function: > > void main(void) { > TH1F **histo; // I know this can be done > histo = malloc(sizeof(TH1F*)*Size); // just by TH1F *histo[Size] > > my_fill(histo); > } > > my_fill(TH1F** htemp) { > for (int i=0; i<Size; i++) > htemp = new TH1F(); > } > > Then it works perfectly. But my problem is that I want my subroutine to > allocate the memory because only within the subroutine I will know what > "Size" show be. > > I tried to do the following: > > void main(void) { > TH1F **histo; > > my_fill(histo); > } > > my_fill(TH1F** htemp) { > htemp = malloc(sizeof(TH1F*)*Size); > for (int i=0; i<Size; i++) > htemp = new TH1F(); > } > > But it doesn't work. Any tips of how to do this? I have tried to do > some simple tests and I found out that the root behaviour is diferent from > the standard c++, maybe this is the problem, I don't know: > > root [0] double x = 3 > root [1] &x > Error: reference type x with no initialization FILE:/tmp/fileVv6eIH_cint LINE:1 > Error: x already declared as different type FILE:/tmp/fileVv6eIH_cint LINE:1 > *** Interpreter error recovered *** > root [2] > > Shouldn't I've got the address of "x" in the code above? > > []'s > > Henrique > **************************************** > State University at Campinas - BRASIL > "Gleb Wathagin" Physics Institute > Department of Cosmic Rays and Chronology > > Henrique Barbosa The Pierre Auger > PhD Student Observatory > ****************************************
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