1. TTree::Draw What is it trying to be? Where is it going?

2. What is it? Quick way of creating Histograms or TEventList from a TTree. Quick way of creating Histograms or TEventList from a TTree. Implement one or 2 simple straight- forward loops Implement one or 2 simple straight- forward loops Outer loop: Outer loop: For each entries For each entries Inner loop: Inner loop: For each elements of the ‘implied’ 1D array For each elements of the ‘implied’ 1D array

3. What is the ‘implied’ 1D array For each variables, all array dimensions are calculated For each variables, all array dimensions are calculated With int fArr[6][4][7] “fArr[][3][]” has 2 dimensions: 6 and 7 For each dimension calculates the minimum size For each dimension calculates the minimum size With fFloat[4][9] “fArr[][3][]+fFloat[][]” has 2 dimensions: 4 and 7 Calculates fArr[ i ][3][ j ]+fFloat[ i ][ j ] for (i,j) in: Calculates fArr[ i ][3][ j ]+fFloat[ i ][ j ] for (i,j) in: (0,0),(0,1)…(0,6),(1,0)…(1,6)…(3,0)…(3,6) (0,0),(0,1)…(0,6),(1,0)…(1,6)…(3,0)…(3,6) Iteration$ with return the ‘index’ in the above mention list (I.e. 6*i+j) Iteration$ with return the ‘index’ in the above mention list (I.e. 6*i+j) Length$ will return the number of element in the list (I.e 4*7=28) Length$ will return the number of element in the list (I.e 4*7=28)

4. Other features The index of an array can be a “formula” The index of an array can be a “formula” If the classes of the objects in the tree is available, on can call their members functions If the classes of the objects in the tree is available, on can call their members functionsfH.GetXaxis().GetXmax() If the objects are of different types, one can cast to a specific type. The objects which are NOT of that type (or an inherited type) are skipped: If the objects are of different types, one can cast to a specific type. The objects which are NOT of that type (or an inherited type) are skipped: With TShape *fShape : “((TBRIK*)fShape)->GetVisibility()>0”

5. New: Custom Histogram Size Abilities to customize bin numbers (in rootrc and function call) Abilities to customize bin numbers (in rootrc and function call) In rootrc file: In rootrc file: Hist.Binning.?D.[x,y,z,Prof,Profx,Profy] Hist.Binning.?D.[x,y,z,Prof,Profx,Profy] In TTree::Draw In TTree::Draw tree.Draw("sqrt(x)>>hsqrt(500,10,20)“ tree.Draw("sqrt(x)>>hsqrt(500,10,20)“ 1 - bins in x-direction 1 - bins in x-direction 2 - lower limit in x-direction 2 - lower limit in x-direction 3 - upper limit in x-direction 3 - upper limit in x-direction 4-6 same for y-direction 4-6 same for y-direction 7-9 same for z-direction 7-9 same for z-direction

6. New: Specials Variables Entry$ Entry$ Return the current entry number; TTree::GetReadEntry() Return the current entry number; TTree::GetReadEntry() Entries$ Entries$ Return the total number of entries; TTree::GetEntries() Return the total number of entries; TTree::GetEntries() Length$ Length$ Return the total number of elements of this formula for this entry (like TTreeFormula::GetNdata() ) Return the total number of elements of this formula for this entry (like TTreeFormula::GetNdata() ) Iteration$ Iteration$ Return the current iteration over this formula for this entry (i.e. Varies from 0 to length$). Return the current iteration over this formula for this entry (i.e. Varies from 0 to length$).

7. Other New Features Array of objects Array of objects Fixed (added?) Support for 1D and 2D graphical cuts Fixed (added?) Support for 1D and 2D graphical cuts TEventList now carries not only the list of entries but also the internal conditions. TEventList now carries not only the list of entries but also the internal conditions. I.e filters both the entry and the array elements inside. I.e filters both the entry and the array elements inside.

8. Other New “Features” Proper treatments of strings and char arrays Proper treatments of strings and char arrays String inside arrays String inside arrays Variable length array inside a non-split TClonesArray Variable length array inside a non-split TClonesArray Variable size arrays coordination Variable size arrays coordination (Between main formula, selection and index formula) (Between main formula, selection and index formula)

9. Outstanding Bugs Check for pointers that are 0 in the method calling chain Check for pointers that are 0 in the method calling chain Handling of variable size array that happens to be of size 1 Handling of variable size array that happens to be of size 1 A few odd problem with strings A few odd problem with strings

10. Question fTracks a TClonesArray of TTrack fTracks a TClonesArray of TTrack fPoints an array of double inside TTrack fPoints an array of double inside TTrack What should the following do? What should the following do?tree->Draw("fTracks.fPoints[][]-fTracks.fPoints[][fTracks.fAvgPoints]"); Either Either fTracks[ I ].fPoints[ J ] - fTracks[ I ].fPoints[fTracks[ I ].fAvgPoints] Or Or fTracks[ I ].fPoints[ J ] - fTracks[ I ].fPoints[fTracks[ J ].fAvgPoints]

11. Future Plan 1. Calling CINT function (or macro file) 2. Allow arguments if function calls In particular, using a notation to be defined, the CINT function will have direct access to the entry data.

12. Future Plan 3. Allow following (transparently) TRef and TRefArray 4. Implement Index$(variable,dimension) 5. Add an interface to pass the histogram by address rather than name