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i am affected by the problem that is very simple just one command if you are using a release older than 6 36 00 just type root config features grep builtin_zlib if no output is printed the build is not affected by the problem what if i need to use an active but older release series also in this case there are solutions for you if root is not configured with the built in zlib the builtin zlib configure option set to off any release can be safely used the vulnerabilities are about root s built in zlib if you are using one of the four actively supported release series with builtin zlib set to on we recommend upgrading to the latest patch release of your branch 6 32 22 6 30 10 6 28 14 6 26 18 to know more about actively supported releases see the release and support plan best danilo for the root project danilo piparo root users workshop 2025 a success 2025 11 24t00 00 00 00 00 2025 11 24t00 00 00 00 00 https root cern blog root_users_workshop_2025 what a week last week the 13th root users workshop took place in valencia spain at the universitat politècnica de valència upv more than 80 scientists and students from institutes in 16 countries convened together to discuss root and shape its future the programme consisted of a number of contributions 56 talks 19 posters 1 training 1 vr booth making it an innovative agenda padded with generous discussion slots we subdivided the week in four tracks experiments and large initiatives presentations data analysis statistical inference and language interoperability of course lhc experiments were present however we also had great talks by other large communities such as belle ii bes iii gravitational waves or future linear collider the event was not even only about particle physics we enjoyed presentations about compiler technology finance and medical physics the workshop was a very rewarding experience for the root project and we are thankful to all the participants for making it a success stay tuned for the next one danilo piparo root summer student course 2025 recap and new video recording 2025 07 29t00 00 00 00 00 2025 07 29t00 00 00 00 00 https root cern blog summer student course 2025 as every summer we organized a number of root courses for a few groups of summer students we held five sessions with around 30 to 40 participants each including one session during the hsf iris hep python for analysis trainings and one as part of the cern openlab workshops the sessions were held in person at cern students were learning about the basics of hep computing with root we introduced topics like histograms graphs and functions including an example of using the functionalities provided by the unified histogram interface recently implemented in root we discussed the basics of parameter estimation and showed how to interact with the root files during the last part of the course we introduced the rdataframe analysis interface and discussed many useful functions and features any particle physics analyst should know for those of you who couldn t make it to the courses in person we prepared a video recording which is available here as the whole course is taught in python using the jupyter notebooks we recommend that you follow along while watching the video the course material is available in this github repository and all instructions are given in the readme at the bottom of the page for the best possible experience we recommend that you use root version 6 36 or higher we hope the video can be of use to anyone starting with root if you have any feedback on what could be improved or added in a more advanced course please don t hesitate to comment below or contact us otherwise if you are teaching root at your institution please feel free to use this training material in your course we would extremely appreciate your feedback on the course and we would be happy to discuss further collaboration so do not hesitate to reach out to us marta czurylo level up your histogram analysis using root s uhi 2025 06 06t00 00 00 00 00 2025 06 06t00 00 00 00 00 https root cern blog uhi for root what if you could intuitively manipulate your root histograms create stunning plots with your favorite python libraries and perform advanced operations all with pythonic ease starting from root 6 36 the unified histogram interface uhi bridges the gap between root s powerful features and python s intuitive apis taking your data analysis workflow to the next level what is uhi the unified histogram interface uhi is a modern api designed to standardize and simplify histogram operations in python fully implemented now in root uhi ensures that all root histogram classes derived from th1 can leverage a consistent intuitive interface for python developers enhanced with a powerful set of functionalities like slicing indexing as well as native integration with popular python plotting libraries making root histograms more versatile than ever how about a quick demo let me show you how you can fill your histograms with numpy arrays directly import matplotlib pyplot as plt import mplhep as hep import numpy as np import root h1 root th1f h1 40 4 4 h1 np random uniform 0 1 40 hep histplot h1 label h1 linewidth 2 yerr false plt title my histo plt show et voilà you can also easily plot root histograms with libraries like matplolib that don t directly support uhi yet using a small trick can you spot it h2 root th2d h2 h2 10 0 1 10 0 1 h2 np random uniform 0 1 10 10 plt imshow h2 values plt colorbar label counts plt title my 2d histo plt show ready to level up your histogram analysis with uhi root histograms now offer python developers an intuitive modern and powerful api check out the root uhi documentation for more implementation details and examples silia taider silia taider cern ch make root your own on macos with nix 2025 05 01t00 00 00 00 00 2025 05 01t00 00 00 00 00 https root cern blog root with nix in this blog post you will learn how to reproducibly build root from source with nix on macos or linux getting you started quickly with hacking the root source code and participate in roots open development introduction to nix if you ve ever tried building a complex c project like root on macos you ve probably wrestled with dependencies that have to be installed with homebrew xcode s quirks and subtle differences in compiler behavior while these tools are powerful in their own domains they aren t always ideal for development environments that require fine grained control reproducibility and consistency across systems that s where nix shines nix is a cross platform package manager that sets itself apart from e g conda homebrew or apt by enforcing fully reproducible environments that don t pollute your system with most package managers one can install and delete packages at will and one has to manually configure the system on top of that it s easy to lose track of how the environment looks like and how it can be reproduced nix solves this problem by allowing you to define exactly what dependencies compilers and configuration flags are used all in a declarative shell nix file when someone else enters the same nix shell they get the same environment also installing development libraries globally with homebrew or relying on xcode s sdk can clutter your system and lead to conflicts nix isolates your development environment in a pure sandbox shell keeping your system unpolluted packages are only loaded when you enter a given nix shell with no trace after you exit the shell other than cached artifacts that can be garbage collected whenever you want since nix is cross platform this post actually applies to any linux distribution as well including of course nixos where the whole system is declared in a single configuration nix file still this post is marketed towards mac users because since there is no official package manager on macos building root on that platform can be particularly challenging one downside of nix is that it s not compliant with linux standard base lsb so you might often have to patch code to use the paths that nix expects fortunately once you have figured out what the right patch is you will never have to solve the same problem again because the solution is set in stone in your nix configuration files still in the beginning there can be a steep learning curve and even though building individual packages like root with nix as described in this blog post is easy things can be more complicated when you want to build more interdependent packages in the same environment on a personal note i have transitioned to nix for all my development work about a year ago and don t have any reason to go back especially for working on roots build system the ability to test root in different environments just by changing a line in my shell nix without any manual bookkeeping of what packages are installed on my system is golden using docker might also give you the reproducibility but for development docker can be quite clunky because of the boundary between the host and the docker image and nix gives you a faster turnaround by caching the environment at the package level and not the image level installing nix installing nix should always be done using the official download instructions performing the recommended multi user installation setting up your root development environment it s good to do your root development in a separate directory for example called root you can create the directory from the terminal mkdir root cd root now it s time to create the shell nix file in that directory here is a suggested shell nix file for building root with debug info and tests content of root shell nix pkgs import nixpkgs let we want to have these python packages in our environment to use together with root and test the pythonizations python3packages with pkgs python3 pkgs matplotlib numba numpy pandas pytest scikit learn xgboost in pkgs mkshell for all the build inputs we inherit the package lists from the official nix root package plus adding some packages that we need for testing gtest etc and faster building ccache nativebuildinputs with pkgs ccache pkgs root nativebuildinputs propagatedbuildinputs pkgs root propagatedbuildinputs buildinputs with pkgs gtest libuuid required for testing python3packages pkgs root buildinputs define aliases for quick configuration and build shellhook alias configure cmake dclang_dir pkgs root clang lib cmake clang dcmake_build_type relwithdebinfo dcmake_cxx_flags fno omit frame pointer dcmake_c_flags fno omit frame pointer dcmake_install_prefix root_install dbuiltin_clang off dbuiltin_llvm off dccache on dfail on missing on dfftw3 on dfitsio off dgnuinstall on dmathmore on droottest on druntime_cxxmodules if pkgs stdenv isdarwin then off else on dsqlite off dtesting on dvdt off dwebgui off root_src alias build and install cmake build target install j12 a few more explanations in several places we refer to pkgs root this points to the official root package in the nixpkgs repository think of nixpkgs of a single huge data structure that declares how to build any package and your shell nix environments are querying this huge data structure to instantiate specific environments that means we can re use any variables that are declared in the nixpkgs world at any time in our shell nix we reuse the variables from pkgs root that list the dependencies also including pkgs root clang which is the patched clang version that root requires this means we don t have to rebuild the patched clang ourselves as it s already in the nix cache side note the fact that all package recipes are in a single repository written in the common domain specific nix language that is basically json on steroids is one of the great strengths of nix the nativebuildinputs propagatedbuildinputs and buildinputs serve slightly different purposes nativebuildinputs lists the build time dependencies buildinputs lists the runtime dependencies propagatedbuildinputs declares runtime dependencies that should automatically be passed to anything that depends on your package if you just use the nix shell environment to build test and use root all in one then there is not a practical difference but it becomes important if you want to write package nix files that declare individual packages that you plan to re use the python packages in the environment are not strictly needed for building root but these are the packages that are commonly used together with root also in the unit tests and tutorials so it s good to have them the shellhook variable contains bash code that is run when opening the nix shell we use it to define aliases for configuring root with the desired cmake configuration flags and then later to build and install root with the desired number of threads 12 threads in our example in the cmake command we set dcmake_install_prefix root_install such that the install directory sits nicely next to the root_src and root_build directories see the page about installing root from source for more info on the root specific cmake flags depending on what root feature you want to develop you have to toggle add or remove flags this blog post is not updated so if the environment doesn t work anymore please reach out to us optimally by opening a github issue requesting a working shell nix example for root development if your shell nix file is in the root directory and you changed to that directory in your terminal you activate the environment by running nix shell it will take some time to download the dependencies to the nix cache if you enter the environment for the first time to exit the environment later run the exit command in the shell building root have you entered the nix shell environment with the configuration file above very good if successful you should now have the green nix shell prompt in your terminal time to clone the root repository git clone https github com root project root git root_src create and enter the build directory mkdir root_build cd root_build configure the build with the command defined in the shellhook which takes about half a minute configure finally build and install root which takes about 15 minutes running the first time on my mac mini m1 with 16 gb build and install are you still in the build directory then you can source the root installation as follows source root_install bin thisroot sh if you want to test the installation you can try to start the root prompt or maybe open a python interpreter and try to import root or if you are adventurous maybe run a root python tutorial python i root_src tutorials roofit roofit rf101_basics py the i flag means that the python interpreter will keep running at the end of the script such that the plot remains opened but it also means you have to manually quit the python interpreter with ctrl d make root your own by changing the source code you have now a clean directory structure for root development the content of your root directory should look like this root_src root_build root_install shell nix we have s...