Contours for 2-D histogram with variable bin width

Mark Boulay (mgb@owl.phy.queensu.ca)
Tue, 23 Feb 1999 12:06:48 -0500 (EST)

Hello All,
I'm trying to define a 2-D histogram with variable
bin width, and then draw a contour map, using root 2.21/03.
The following code illustrates how the histogram is created:

{
Float_t binsx[6] = { 1e-5,1e-4,1e-3,1e-2,1e-1,1 };
Float_t binsy[6] = { 1e-5,1e-4,1e-3,1e-2,1e-1,1 };
TH2F *hist2 = new TH2F("hist2","Variable bin histogram",5,bx,5,by);
Int j,k;

for (j=1; j< 6; j++)
{
for(k=1; k < 6; k++)
{
hist2->SetCellContent(j,k,(Float_t)(j+k));
}
}
}

If I then try to draw this histogram with Draw(), only the axies are
drawn. Scanning the mouse over the pad (with Event Status on) shows
that the cells have the proper contents. If I then use
Draw("cont"), the same axies are again drawn (without contours). This
time the Event Status shows that all points inside the axies are in
cell (6,6).

Thanks in advance for any help,

Mark.


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= Mark Boulay =
= Department of Physics phone/voice mail: (613) 533-6861 =
= Queen's University fax: (613) 533-6813 =
= Kingston, Ontario email: mgb@sno.phy.queensu.ca =
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