I had asked this question some weeks later, but I don't receive reply not yet. Sorry about same question re-posting. If I run this program, I met this warning, ------------------------------------------------------------------ Warning in <TH1::Build>: Replacing existing histogram: TMatrix (Potential memory leak). ------------------------------------------------------------------ How can I avoid this warning? ----<Source>----------- #include <iostream> #include <string> #include <fstream> #include <cmath> using namespace std; #include "TMatrix.h" #include "TCanvas.h" int main(void) { TCanvas *c = new TCanvas("c1"); int i,j; TMatrix Ex(10,10); for(i=0;i<10;i++) for(j=0;j<10;j++) Ex(i,j) = 0.0; for(i=0;i<10;i++) for(j=0;j<10;j++) { Ex(i,j) = i*j; Ex.Draw("SURF"); c->Update(); } getchar(); return(0); }// end of main -- Sincerely, Ki-young
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