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ROOT 6.08/07 Reference Guide |
Illustrates how to retrieve TTree variables in arrays.
This example:
Draw
method with goff
option,GetVal
,The option goff
in TTree::Draw
behaves like any other drawing option except that, at the end, no graphics is produced ( goff
= graphics off). This allows to generate as many TTree variables as needed. All the graphics options (except para
and candle
) are limited to four variables only. And para
and candle
need at least two variables.
Note that by default TTree::Draw creates the arrays obtained with GetVal with a length corresponding to the parameter fEstimate
. By default fEstimate=1000000 and can be modified via TTree::SetEstimate. To keep in memory all the results use:
SetEstimate should be called if the expected number of selected rows is greater than 1000000.
Definition in file treegetval.C.