1 files changed, 138 insertions, 0 deletions

diff --git a/examples/repmat.ipynb b/examples/repmat.ipynb
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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# repmat"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "An alternative implementation of `repmat` using the new in-place tools."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [],
+   "source": [
+    ":ext FlexibleContexts\n",
+    "\n",
+    "import Numeric.LinearAlgebra\n",
+    "import Numeric.LinearAlgebra.Devel"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "m = (3><4)[1..] :: Matrix Z"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "(3><4)\n",
+       " [ 1,  2,  3,  4\n",
+       " , 5,  6,  7,  8\n",
+       " , 9, 10, 11, 12 ]"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
+   "source": [
+    "m"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "import Control.Monad.ST"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [],
+   "source": [
+    "rpmt m i j = runST $ do\n",
+    "    x <- newUndefinedMatrix RowMajor dr dc\n",
+    "    sequence_ [ setMatrix x a b m | a <- [0,r..dr], b <-[0,c..dc] ]\n",
+    "    unsafeFreezeMatrix x\n",
+    "  where\n",
+    "    (r,c) = size m\n",
+    "    dr = i*r\n",
+    "    dc = j*c"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "(6><12)\n",
+       " [ 1,  2,  3,  4, 1,  2,  3,  4, 1,  2,  3,  4\n",
+       " , 5,  6,  7,  8, 5,  6,  7,  8, 5,  6,  7,  8\n",
+       " , 9, 10, 11, 12, 9, 10, 11, 12, 9, 10, 11, 12\n",
+       " , 1,  2,  3,  4, 1,  2,  3,  4, 1,  2,  3,  4\n",
+       " , 5,  6,  7,  8, 5,  6,  7,  8, 5,  6,  7,  8\n",
+       " , 9, 10, 11, 12, 9, 10, 11, 12, 9, 10, 11, 12 ]"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
+   "source": [
+    "rpmt m 2 3"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Haskell",
+   "language": "haskell",
+   "name": "haskell"
+  },
+  "language_info": {
+   "codemirror_mode": "ihaskell",
+   "file_extension": ".hs",
+   "name": "haskell",
+   "version": "7.10.1"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}