{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<script async src=\"https://www.googletagmanager.com/gtag/js?id=UA-59152712-8\"></script>\n",
    "<script>\n",
    "  window.dataLayer = window.dataLayer || [];\n",
    "  function gtag(){dataLayer.push(arguments);}\n",
    "  gtag('js', new Date());\n",
    "\n",
    "  gtag('config', 'UA-59152712-8');\n",
    "</script>\n",
    "\n",
    "# Exercise (Loop Generation) Solution\n",
    "\n",
    "## *Courtesy Ken Sible*"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "execution": {
     "iopub.execute_input": "2021-03-07T17:14:40.245536Z",
     "iopub.status.busy": "2021-03-07T17:14:40.244431Z",
     "iopub.status.idle": "2021-03-07T17:14:40.249741Z",
     "shell.execute_reply": "2021-03-07T17:14:40.249146Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "for (int n = 0; n < (Nt - 1); n++) {\n",
      "    u[n][0] = u[n][Nx] = 0;\n",
      "    for (int k = 1; k < (Nx - 1); k++) {\n",
      "        u[n + 1][k] = u[n][k] + r*(u[n][k + 1] - 2*u[n][k] + u[n][k - 1]);\n",
      "    } // END LOOP: for (int k = 1; k < (Nx - 1); k++)\n",
      "    for (int k = 0; k < Nx; k++) {\n",
      "        u[n][k] = u[n + 1][k];\n",
      "    } // END LOOP: for (int k = 0; k < Nx; k++)\n",
      "} // END LOOP: for (int n = 0; n < (Nt - 1); n++)\n",
      "\n"
     ]
    }
   ],
   "source": [
    "from loop import loop # Import NRPy+ module for loop generation\n",
    "\n",
    "boundary = 'u[n][0] = u[n][Nx] = 0;\\n'\n",
    "inner_1 = loop('k', '1', '(Nx - 1)', '1', '', interior='u[n + 1][k] = u[n][k] + r*(u[n][k + 1] - 2*u[n][k] + u[n][k - 1]);')\n",
    "inner_2 = loop('k', '0', 'Nx', '1', '', interior='u[n][k] = u[n + 1][k];')\n",
    "print(loop('n', '0', '(Nt - 1)', '1', '', interior=(boundary + inner_1 + inner_2[:-1])))"
   ]
  }
 ],
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