[ROOT] [Fwd: TTree->Draw does not accept "=" as Boolean operation]

From: Malcolm Davidson (davidson@cesbio.cnes.fr)
Date: Tue Dec 05 2000 - 15:32:27 MET 

Sorry,

Forgot that in C++ we use == and
iem_data->Draw("shh:reps","theta==25") works fine.


Thanks

Malcolm

--
<>------------------------------------------------<>
Malcolm W. J. Davidson

Centre D'Etudes Spatiales de la Biosphere (CESBIO)
UMR 5639 CNES-CNRS-UPS
18, Avenue Edouard Belin
F-31401 Toulouse Cedex 4
FRANCE

e-mail : davidson@cesbio.cnes.fr
phone (33)(0)5.61.55.85.84
fax   (33)(0)5.61.55.85.00
<>------------------------------------------------<>

attached mail follows:

Hello, I'm using the TTree Draw method for displaying histograms and was very surprised that the following worked: iem_data->Draw("shh:reps","theta <=25") // Draw all coefficients for incidence angles le to 25 degrees whereas the following did not (I do have theta's = 25 in the ntuple) root [7] iem_data->Draw("shh:reps","theta=25") iem_data->Draw("shh:reps","theta=25") *ERROR 26 : Unknown name : "theta=25" (Int_t)(-1) Is this normal ? It seems to me that the equal condition is quite important as well ? Many thanks in advance. Malcolm p.s. I am using root compiled on Linux Mandrake 7.2 (i386). <>------------------------------------------------<> Malcolm W. J. Davidson Centre D'Etudes Spatiales de la Biosphere (CESBIO) UMR 5639 CNES-CNRS-UPS 18, Avenue Edouard Belin F-31401 Toulouse Cedex 4 FRANCE e-mail : davidson@cesbio.cnes.fr phone (33)(0)5.61.55.85.84 fax (33)(0)5.61.55.85.00 <>------------------------------------------------<>

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