ROOT Team Meeting

Friday 23 Jan 2009, 11:00 → 12:50 Europe/Zurich

32/1-A24 (CERN)

11:00 → 11:01 News

All work packages present their new web site under drupal

-Rene will be away until Thursday morning (Long term data preservation workshop at DESY) -Lukasz issue still not solved (complex) -Rene contacted by Staczec Jadach for a possible "free" Polish summer student (like Magda) LLVM project presented at -the LCGAA meeting. Very good presentations by Fons and Axel. The Axel demo was really great -the AForum. The main discussion was about the impact on CINT7 by CMS. As a reasult the following statement was sent to the AForum Some precision following our discussion with CINT7 yesterday at the AF. CINT7 is ready to be used by -the root7.exe module instead of root.exe -a user executable can be built by linking with libCint7 instead of libCint and there is no special call to activate CINT7 When using CINT7 in conjunction with Cintex/Reflex, see below I had a discussion with Axel and Philippe to clarify the situation. This mail from Axel/Philippe is a good summary Rene "CINT7 works perfectly with ROOT. CINT7 does _not_ yet work in conjunction with genreflex, though. The missing parts are basically a small subset of what is currently provided by libCintex. The plan is to migrate and adapt that relevant part into ROOT, and to allow to specify that genreflex should use CINT7 instead of Cintex. If CMS can offer a dedicated contact person (in the sense that code changes can be tested within a few hours, i.e. I'm not suggesting a 100% FTE allocation for this!) then I estimate the time to implement and test this with CMS to be four months. The vast majority of this will be the testing phase. Ideally both the development and the testing would happen at FNAL; ROOT@FNAL is happy to take that over for the ROOT side." ========================================================== -ALL TEAM MEMBERS SHOULD FEEL MOTIVATED BY THIS PROJECT ==========================================================

11:02 → 11:05 Requests for summer students

The requests for summer students are presented. Please send job description before Thursday 22

ROOT Math Libraries development ============================== The candidate will be integrated in the team of the Math work package of the ROOT project. This team has the responsibility of providing the basic mathematical libraries to physicists developing reconstruction and analysis programs and give support to them. The main task of the student will be to design and implement new C++ classes for new algorithms and statical methods which are planned for inclusion in the ROOT math libraries. An example of these, are classes for non-parametric density estimation or new classes based on the GNU Scientific Library and providing functionality like wavelet transforms or smoothing using splines. In addition, the student will work on providing validation tests of the new implementations and contribute to the improving of the online documentation and tutorials which will be published on the Web site. Main Supervisor: Lorenzo Moneta Second Supervisor: David Gonzalez Maline Student Profile: Mathematician/Physicist/Computing Scientist Skills required: some basic knowledge of C++, applied mathematics and/or statistics. Training value: learn numerical computation and statistical methods and improve the knowledge of object oriented languages like C++ User Interface for an LLVM base C++ interpreter =============================================== ROOT's interpreter is the primary means of interaction with ROOT. We are planning on replacing it with a completely new interpreter which will be based on an exciting new compiler infrastructure project (llvm.org). One of the key ingredients will again be the user interaction - and for that we need a prompt. In the end, that prompt will allow users to write C++, copy and paste, have a history, do tab-completion, highlight matching parentheses and whatever else might be possible to do at a prompt! It has to work on Linux, Windows, MacOS, Solaris, and any other platform that ROOT and LLVM support. Nothing like this exists - and the summer student's project will be to implement the basic infrastructure for this at least on Linux, starting from a proof of concept that is already available. It will be used by almost every single ROOT user and thus by almost every single LHC physicist. This project is thus guaranteed to have a huge impact. Because this project is so unique, and because prompt-based user interaction is a frequent problem, this project will almost certainly also evoke outside interest as a multi-platform readline replacement. Skills: computer scientist with very good knowledge of C and C++! Supervisor: Axel Naumann Second supervisor:Bertrand Bellenot GUI === The candidate will be working for the ROOT project in the Graphical User Interface (GUI) work package to participate in the development of the ROOT GUI Builder. The ROOT GUI classes support an extensive and rich set of widgets. The widget classes interface to the underlying graphics system via a single abstract class. Concrete versions of this abstract class have been implemented for X11 and Win32, thereby making the ROOT GUI fully cross-platform. The ROOT GUI builder provides graphical user-interface (GUI) tools for developing user interfaces based on the ROOT GUI classes. It includes over 30 advanced widgets and has as a goal to offer the complete set of features needed for developing the GUI projects. It gives developers an effective object-oriented development environment and accelerates the GUI development life cycles. The assignment of the candidate will be to extend the palette of widgets already available in the GUI Builder and to consolidate/improve its usability. Improvements of the GUI builder 'look and feel' is also foreseen. Programming skills in high-level languages such as C++ is required. Knowledge and experience of programming under Linux/Unix and Windows is highly desirable. ROOT Graphics ============= The ROOT's graphical libraries provide many functions including basic graphics, high-level visualization techniques, output on files, 3D viewing etc. They use well-known world standards to render graphics on screen (X11, GDK, Qt, and OpenGL), to produce high-quality output files (PostScript, PDF), and to generate images for Web publishing (SVG, GIF, JPEG, etc.). Many techniques allow visualization of all the basic ROOT data types. This year we can propose two subjects of work: 1) Some physics plots use a reference system (luminosity, magnitudes) which is reversed. Therefore, some ROOT users require to make a plots in which one or both of the axes are reversed. The implementation requires changes in the graphics kernel. The AITOFF, MERCATOR etc, projections are available for some type of representation but are still missing for COLor plots for instance. Specific axis for this projection should be also implemented. 2) Retrieve the data from a binary image using a simple "pattern recognition" technique. Sometimes the data files used to produce an image have been lost and what remains only is a binary image (gif, png etc). It would be nice to have a tool which automatically retrieve the data points, axis etc ... from the binary image. The functionnality provided by the libAfterimage library should help implementing this tool. Other specific requirement: The candidates should be familiar with the C++ programming language. Some knowledge in computer graphics would be also useful. Supervisor: Olivier Couet Second supervisor: Student: computer scientist

11:05 → 11:15 Core infrastructure in drupal

Speaker: Fons

11:15 → 11:25 I/O and Trees in drupal

Speaker: Philippe

11:25 → 11:35 CINT/Reflex in drupal

Speaker: Axel

FYI: http://axel.home.cern.ch/axel/htmldoc/CORE_BASE_Index.html http://axel.home.cern.ch/axel/htmldoc/TObject.html Not finalized yet (esp. the class doc will still be adapted a bit) but it's getting there :-) Cheers, Axel.

11:35 → 11:45 MATH in drupal

Speaker: Lorenzo

11:45 → 11:55 GUI in drupal

Speaker: Bertrand

11:55 → 12:05 2-d graphics , asimage, picture gallery in drupal

Speaker: Olivier

12:05 → 12:15 PROOF in drupal

Speaker: Gerri

12:15 → 12:25 3-d graphics, Gl, EVE in drupal

Speaker: Matevz