xarray_sel_loses_chunks.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "import xarray\n",
    "import dask.array"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": false
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    {
     "data": {
      "text/plain": [
       "<xarray.DataArray 'wrapped-0bd22a36c2fc0082109cd7e2896d38e9' (dim_0: 15)>\n",
       "dask.array<wrapped..., shape=(15,), dtype=float64, chunksize=(5,)>\n",
       "Coordinates:\n",
       "  * dim_0    (dim_0) int64 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a = xarray.DataArray(dask.array.ones(15, chunks=5))\n",
    "a"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "((5, 5, 5),)"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a.chunks"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<xarray.DataArray 'wrapped-0bd22a36c2fc0082109cd7e2896d38e9' (dim_0: 10)>\n",
       "dask.array<getitem..., shape=(10,), dtype=float64, chunksize=(10,)>\n",
       "Coordinates:\n",
       "  * dim_0    (dim_0) int64 0 1 7 14 1 1 1 1 1 1"
      ]
     },
     "execution_count": 18,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "b = a.isel(dim_0=[0, 1, 7, 14, 1, 1, 1, 1, 1, 1])\n",
    "b"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "((10,),)"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# Expected: ((3, 1, 5, 1),)\n",
    "b.chunks"
   ]
  }
 ],
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