{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Test Histogramm Fitting in pyROOT"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "import math\n",
    "#import ROOT\n",
    "from ROOT import TCanvas, TFile, TProfile, TNtuple, TH1D, TH2D, TF1 \n",
    "from ROOT import gROOT, gBenchmark, gRandom, gSystem"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "\n",
    "Read data previously used from text file and put it in a numpy array"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "data = np.genfromtxt('D0Mass.txt', dtype='d')\n",
    "print(data)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Create histogramm and draw"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "d0 = TH1D( 'd0', 'D0 Mass ', 200, 1700. , 2000. )\n",
    "for x in data :\n",
    "    d0.Fill(x)\n",
    "c = TCanvas( 'myC', 'Dynamic Filling Example',700, 500 )\n",
    "d0.Draw()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "To display the notebook draw the canvas."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# %jsroot on\n",
    "c.Draw()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "perform Fit"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "func = TF1(\"func\", 'gaus', 1840. , 1880.)\n",
    "myfit = d0.Fit(func,\"S\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "c.Draw()"
   ]
  }
 ],
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    "name": "ipython",
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   "file_extension": ".py",
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   "pygments_lexer": "ipython3",
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