Hi,
For the life of me I can’t get a 2D array written to a branch when it has both indicies specified by other items in the tree (“for the life of me” == some number of hours which is too embarassing to admit). I’m using 5.24/04 for this test. Here is the code:
[code]void test3(int nEvents)
{
TFile *f = new TFile("…/test3.root", “RECREATE”);
TTree *t = new TTree ("testTree", "Test of the tree");
Int_t nx = 0, ny = 0;
Double_t info[maxArraySize2D][maxArraySize2D];
for (int ix = 0; ix < maxArraySize2D; ix++) {
for (int iy = 0; iy < maxArraySize2D; iy++) {
info[ix][iy] = 0.0;
}
}
t->Branch("nx", &nx, "nx/I");
t->Branch("ny", &ny, "ny/I");
t->Branch("info", info, "info[nx][ny]/D");
for (int i = 0; i < nEvents; i++) {
nx = (int) gRandom->Uniform(maxArraySize2D);
ny = (int) gRandom->Uniform(maxArraySize2D);
/// Zero it out
for (int ix = 0; ix < nx; ix++) {
for (int iy = 0; iy < ny; iy++) {
info[ix][iy] = 0.0;
}
}
/// Now fill it all in!
for (int ix = 0; ix < nx; ix++) {
int nyToFill = (int) gRandom->Uniform(ny);
for (int iy = 0; iy < nyToFill; iy++) {
info[ix][iy] = gRandom->Gaus(0.0, 1000.0);
}
}
//std::cout << i << ": nx=" << nx << " ny=" << ny << " info[1][1]=" << info[1][1] << std::endl;
t->Fill();
}
t->Write();
f->Write();
f->Close();
delete f;
}[/code]
If i just use one index in the Branch specification (i.e. “info[nx][10]/D”) then it works. It doesn’t matter which index - so long as there aren’t two. I’ve looked through the docs and I don’t see mention of this limitation and I see it used in code I’ve played with. Am I doing something dumb above?
