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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
}
|
