Broken Holoviews example 2

Broken Holoviews example 2.ipynb

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 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# This notebook reproduces a bug in Holoviews\n",
    "\n",
    "Unable to alter range of VLine or empty overlay or any combination"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import pandas as pd\n",
    "import numpy as np\n",
    "%matplotlib inline"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import holoviews as hv\n",
    "from bokeh.io import output_notebook\n",
    "import param\n",
    "import parambokeh\n",
    "from holoviews.streams import Stream, Pipe, ParamValues, Tap, PointerX\n",
    "\n",
    "hv.notebook_extension('bokeh')\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "x = np.linspace(-2, 2, 100)\n",
    "x2 = x**2\n",
    "x3 = x**3\n",
    "x4 = x**4"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Show the data using a library that isn't the \"system under test\"\n",
    "df = pd.DataFrame({\"x\": x, \"x2\": x2, \"x3\": x3, \"x4\": x4})\n",
    "df.plot(x='x')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "df1 = df.set_index('x').stack().reset_index()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "df1 = df1.rename(columns={\"level_0\": \"x\", \"level_1\": \"w\", 0: \"y\"})"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "overlay = hv.Table(df1).to(hv.Curve, 'x', 'y', groupby='w').overlay()\n",
    "overlay"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Setting range on hv.Overlay works\n",
    "\n",
    "overlay.redim.range(x=(-1, 1))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "empty_overlay = hv.Table(df1[:0]).to(hv.Curve, 'x', 'y', groupby='w').overlay()\n",
    "empty_overlay"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Setting range on an empty NdOverlay is broken\n",
    "\n",
    "empty_overlay.redim.range(x=(-1,1)).range('x')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Setting range on a VLine is broken\n",
    "\n",
    "hv.VLine(x=1.0).redim.range(x=(-1,1))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Setting range on (empty NdOverlay)*VLine broken\n",
    "(hv.VLine(x=1.0)*empty_overlay).redim.range(x=(-1,1))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Setting range on an empty Curve is fine\n",
    "hv.Curve([]).redim.range(x=(-1, 1))"
   ]
  }
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