Hi Chris,
It turns out that Boolean variables must be assigned the type "b" and not
"B".
If you do not want to recreate your tree, you can do the following
TLeaf *leaf = ntp100->GetLeaf("ispMicroLoose");
leaf->SetUnsigned();
You can set this attribute permanent on the file if you open the file
in "update" mode and do:
ntp100->Write();
after having changed the leaf attribute.
Rene Brun
On Fri, 10 Aug 2001, Chris Roat wrote:
> I am using 3.00-06 on a Pentium machine running RedHat 7.1.
>
> Your example works for me. Thank you.
>
> I've attached the root file I'm using. Perhaps you can tell me how it
> might have been generated wrong? The boolean variable in question is
> ispMicroLoose in the tree ntp100.
>
> The difference I see is the substitution of /B (my tree) for /b (your
> tree) in the branch title. I can change the tree by getting the branch
> and using SetTitle on it to change /B to /b. I still have the same
> problem.
>
> To summarize, the second command below actually selects MORE events
> than the first, even though additional cuts are applied. It seems to
> ignore ispMicroLoose.
>
> mytree->Draw("p", "ispMicroLoose")
> mytree->Draw("p", "p>0&&ispMicroLoose")
>
> Thanks,
> Chris
>
>
>
>
> *** Today, you (Rene Brun) wrote ***
>
> | Hi Chris,
> |
> | I do not see any problems with booleans. In the attachment you will
> | find a variant of the standard tutorial tree1.C with a boolean variable.
> | You can play with it with the type of selection in your mail.
> |
> | I take once more this opportunity to request that:
> | - the ROOT version number and the machine be specified in the mail
> | - also always specify a subject in the mail. This facilitates the archiving
> | and the search.
> |
> | Rene Brun
> |
> | Chris Roat wrote:
> | >
> | > Hello Rooters,
> | >
> | > I am not clear on to use booleans work in complex (>1 cut) selection
> | > expressions. For instance, if I have a tree with 2 floats, floatA and
> | > floatB, and a bool, boolA, I try the following 4 cases.
> | >
> | > Note: In my tree, all floatB's are greater than zero. The cut is included
> | > to illustrate my problem. boolA's are both true and false.
> | >
> | > a) tree->Draw("floatA", "floatB>0")
> | > b) tree->Draw("floatA", "boolA")
> | > c) tree->Draw("floatA", "(floatB>0)&&(boolA)")
> | > d) tree->Draw("floatA", "(floatB>0)*(boolA)")
> | >
> | > As expected, a) produces a plot of the full tree.
> | >
> | > As expected, b) produces a plot of the tree subset where bool is true.
> | >
> | > NOT as expected, c) & d) produced a plot of the whole tree. Somehow my
> | > bool test is not included in the selection criteria.
> | >
> | > What am I doing incorrectly?
> | >
> | > Thanks for your help,
> | > Chris
>
>
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