{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "cf5f72c3",
   "metadata": {},
   "source": [
    "# Matplotlib pour l'affichage de courbes"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "92233a49",
   "metadata": {},
   "source": [
    "**Matplotlib** est une bibliothèque permettant de gérer l'affichage de graphiques en tout genre.\n",
    "\n",
    "Pour pouvoir l'utiliser, il est nécessaire au préalable qu'elle soit installée :\n",
    "\n",
    "**pip install matplotlib**\n",
    "\n",
    "(uniquement sur votre propre machine en local)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "bac6a4ea",
   "metadata": {},
   "source": [
    "Il faut ensuite importer **pyplot**, qui dépend de **matplotlib** par la commande suivante :"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "dd7b264f",
   "metadata": {},
   "outputs": [],
   "source": [
    "from matplotlib import pyplot as plt"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "349c69c5",
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e1e489b4",
   "metadata": {},
   "source": [
    "La fonction de **pyplot** permettant d'afficher des graphiques est la fonction **plot**. Elle nécessite des vecteurs ou des matrices pour fonctionner."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "7f091189",
   "metadata": {},
   "outputs": [],
   "source": [
    "theta1 = np.linspace(0, 2*np.pi, 14)\n",
    "y1 = np.sin(theta1)\n",
    "theta2 = np.linspace(0, 2*np.pi, 101)\n",
    "y2 = np.sin(theta2)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "9d1b0b20",
   "metadata": {},
   "source": [
    "Exemple de la fonction *sinus* prise sur l'intervale $[ 0 , 2\\pi ]$, dans deux cas différents :\n",
    "\n",
    "- 14 points sur la période\n",
    "- 101 points sur la période"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "7c6344dc",
   "metadata": {},
   "outputs": [],
   "source": [
    "plt.figure()\n",
    "plt.plot(theta1, y1, '*', label='14 points')\n",
    "plt.plot(theta2, y2, label='101 points')\n",
    "plt.xlabel(r'$\\theta$  (rd)')\n",
    "plt.ylabel(r'fonction $\\sin(\\theta)$')\n",
    "plt.legend()\n",
    "plt.show()"
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3 (ipykernel)",
   "language": "python",
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  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
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   "file_extension": ".py",
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