0 based and 1 based indexings

0-indexing to 1-indexing.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "## conversion 0-indexing to Julia's one"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "getj (generic function with 1 method)"
      ]
     },
     "execution_count": 32,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "function getj(i,N)\n",
    "    j=round(Int64,rem(N+i,N)+1)\n",
    "    return j\n",
    "end"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "### 0-index : [-5, -4, -3, -2, -1,  0,  1,  2,  3,  4]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "f=[-5, -4, -3, -2, -1,  0,  1,  2,  3,  4];"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "-5"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "f[1] ### wrong, should give 0 "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 41,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0 index=-5 -> corresponding 1-index=6\n",
      "0 index=-4 -> corresponding 1-index=7\n",
      "0 index=-3 -> corresponding 1-index=8\n",
      "0 index=-2 -> corresponding 1-index=9\n",
      "0 index=-1 -> corresponding 1-index=10\n",
      "0 index=0 -> corresponding 1-index=1\n",
      "0 index=1 -> corresponding 1-index=2\n",
      "0 index=2 -> corresponding 1-index=3\n",
      "0 index=3 -> corresponding 1-index=4\n",
      "0 index=4 -> corresponding 1-index=5\n"
     ]
    }
   ],
   "source": [
    "for i=-5:4\n",
    "    println(\"0 index=\",i,\" -> corresponding 1-index=\",getj(i,length(f)))\n",
    "end"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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