Learning 4 Programming languages at the same time: C++ ,C , Python and Javascript¶
try commands from https://root.cern.ch/notebooks/HowTos/HowTo_ROOT-Notebooks.html but I set default to c++, so you need to use %%python when you do python code.
in order to execute code press shift+enter
Now with the new ROOT Python kernel you should first do
import ROOT
Then you can get cpp interpreter inside the notebook with:
cxx
cout <<"hello"
The main function in c++ or c is not needed but we will show them from time to time.
%jsroot on switches on the interactive root plots
In [1]:
import ROOT
In [2]:
%jsroot on
In [3]:
h = ROOT.TH1F("gauss","Example histogram",100,-4,4)
h.FillRandom("gaus")
In [4]:
c = ROOT.TCanvas("myCanvasName","The Canvas Title",800,600)
h.Draw()
In [5]:
c.Draw()
c++ and python work together
In [6]:
%%cpp
gauss->Fit("gaus", "S");
myCanvasName->Draw();
**************************************** Minimizer is Minuit2 / Migrad Chi2 = 65.0502 NDf = 82 Edm = 4.60684e-07 NCalls = 55 Constant = 157.425 +/- 2.76819 Mean = 0.0138321 +/- 0.0143799 Sigma = 1.00178 +/- 0.0104857 (limited)
Installing fortran magics¶
Attention ipython 9.7.0 became incompatible with fortran-magic 0.9. So we fix versions here for now.
In [7]:
%pip install numpy matplotlib fortran-magic==0.9 jupyterlab==4.4.10 notebook==7.4.7 metakernel==0.30.3 ipython==9.6.0
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/home/k/miniforge3/envs/ROOT5/lib/python3.11/site-packages (from bleach[css]!=5.0.0->nbconvert>=6.4.4->jupyter-server<3,>=2.4.0->jupyterlab==4.4.10) (1.4.0) Requirement already satisfied: fastjsonschema>=2.15 in /home/k/miniforge3/envs/ROOT5/lib/python3.11/site-packages (from nbformat>=5.3.0->jupyter-server<3,>=2.4.0->jupyterlab==4.4.10) (2.21.2) Requirement already satisfied: ptyprocess>=0.5 in /home/k/miniforge3/envs/ROOT5/lib/python3.11/site-packages (from pexpect>=4.8->metakernel==0.30.3) (0.7.0) Requirement already satisfied: six>=1.5 in /home/k/miniforge3/envs/ROOT5/lib/python3.11/site-packages (from python-dateutil>=2.7->matplotlib) (1.17.0) Requirement already satisfied: charset_normalizer<4,>=2 in /home/k/miniforge3/envs/ROOT5/lib/python3.11/site-packages (from requests>=2.31->jupyterlab-server<3,>=2.27.1->jupyterlab==4.4.10) (3.4.4) Requirement already satisfied: urllib3<3,>=1.21.1 in /home/k/miniforge3/envs/ROOT5/lib/python3.11/site-packages (from requests>=2.31->jupyterlab-server<3,>=2.27.1->jupyterlab==4.4.10) (2.5.0) Requirement already satisfied: lark>=1.2.2 in /home/k/miniforge3/envs/ROOT5/lib/python3.11/site-packages (from rfc3987-syntax>=1.1.0->jsonschema[format-nongpl]>=4.18.0->jupyter-events>=0.11.0->jupyter-server<3,>=2.4.0->jupyterlab==4.4.10) (1.3.1) Requirement already satisfied: cffi>=1.0.1 in /home/k/miniforge3/envs/ROOT5/lib/python3.11/site-packages (from argon2-cffi-bindings->argon2-cffi>=21.1->jupyter-server<3,>=2.4.0->jupyterlab==4.4.10) (2.0.0) Requirement already satisfied: pycparser in /home/k/miniforge3/envs/ROOT5/lib/python3.11/site-packages (from cffi>=1.0.1->argon2-cffi-bindings->argon2-cffi>=21.1->jupyter-server<3,>=2.4.0->jupyterlab==4.4.10) (2.22) Requirement already satisfied: soupsieve>1.2 in /home/k/miniforge3/envs/ROOT5/lib/python3.11/site-packages (from beautifulsoup4->nbconvert>=6.4.4->jupyter-server<3,>=2.4.0->jupyterlab==4.4.10) (2.8) Requirement already satisfied: arrow>=0.15.0 in /home/k/miniforge3/envs/ROOT5/lib/python3.11/site-packages (from isoduration->jsonschema[format-nongpl]>=4.18.0->jupyter-events>=0.11.0->jupyter-server<3,>=2.4.0->jupyterlab==4.4.10) (1.4.0) Requirement already satisfied: tzdata in /home/k/miniforge3/envs/ROOT5/lib/python3.11/site-packages (from arrow>=0.15.0->isoduration->jsonschema[format-nongpl]>=4.18.0->jupyter-events>=0.11.0->jupyter-server<3,>=2.4.0->jupyterlab==4.4.10) (2025.2) Requirement already satisfied: executing>=1.2.0 in /home/k/miniforge3/envs/ROOT5/lib/python3.11/site-packages (from stack_data->ipython==9.6.0) (2.2.1) Requirement already satisfied: asttokens>=2.1.0 in /home/k/miniforge3/envs/ROOT5/lib/python3.11/site-packages (from stack_data->ipython==9.6.0) (3.0.1) Requirement already satisfied: pure_eval in /home/k/miniforge3/envs/ROOT5/lib/python3.11/site-packages (from stack_data->ipython==9.6.0) (0.2.3) Note: you may need to restart the kernel to use updated packages.
In [8]:
import fortranmagic
In [9]:
fortranmagic.__version__
Out[9]:
'0.9'
In [10]:
%load_ext fortranmagic
In [11]:
import os
import sys
import numpy as np
if sys.platform.startswith("win"):
# Depends of system, python builds, and compilers compatibility.
# See below.
f_config = "--fcompiler=gnu95 --compiler=mingw32"
else:
# For Unix, compilers are usually more compatible.
f_config = ""
# Disable only deprecated NumPy API warning without disable any APIs.
f_config += " --extra '-DNPY_NO_DEPRECATED_API=0'"
%fortran_config {f_config}
New default arguments for %fortran: --extra '-DNPY_NO_DEPRECATED_API=0'
In [12]:
%%fortran
subroutine f1(x, y, z)
real, intent(in) :: x,y
real, intent(out) :: z
z = sin(x+y)
end subroutine f1
In [13]:
f1(1.0, 2.1415)
Out[13]:
9.26574066397734e-05
In [ ]: