Convert Magnetic Susceptibility with IPy widgets

Chi.ipynb

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  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# A very simple magnetic susceptibility conversion tool\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "application/vnd.jupyter.widget-view+json": {
       "model_id": "20b8e93ff2c143b4b7f866f7718ffd12",
       "version_major": 2,
       "version_minor": 0
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      "text/plain": [
       "VBox(children=(HBox(children=(Label(value='X in'), Text(value='', layout=Layout(width='190px'), placeholder='0…"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "from __future__ import division\n",
    "import ipywidgets as ipw\n",
    "\n",
    "def mk_unit():\n",
    "    return ipw.Dropdown(\n",
    "        options=[('Xv SI [1]', 1),\n",
    "                 ('Xv CGS [1 or emu]', 2),\n",
    "                 ('Xm SI [m^3/kg]', 3), \n",
    "                 ('Xm CGS [cm^3/g]', 4),\n",
    "                 ('Xmol SI [m^3/mol]', 5),\n",
    "                 ('Xmol CGS [cm^3/mol]', 6)\n",
    "                ],\n",
    "        value=1,\n",
    "        description='Units:',\n",
    "    )\n",
    "\n",
    "chiinput       = (ipw.Text(placeholder=\"0\", layout=ipw.Layout(width=\"190px\"),  disabled=False), mk_unit())\n",
    "chioutput      = (ipw.Text(placeholder=\"0\", layout=ipw.Layout(width=\"190px\"),  disabled=True),  mk_unit())\n",
    "molar_mass_wdg = ipw.Text(placeholder=\"0\", layout=ipw.Layout(width=\"190px\"))\n",
    "density_wdg    = ipw.Text(placeholder=\"0\", layout=ipw.Layout(width=\"190px\"))\n",
    "\n",
    "def on_click(btn):\n",
    "    fourpi=12.566370614359172\n",
    "    input_to_SI_adim = 9.0E9 # A crazy number that should never be used.\n",
    "    try:\n",
    "        inv = float(chiinput[0].value)\n",
    "    except:\n",
    "        chioutput[0].value = \"Error: input value missing\"\n",
    "        return\n",
    "    try:\n",
    "        density = float(density_wdg.value)\n",
    "    except:\n",
    "        if chiinput[1].value >= 3 or chiinput[1].value >= 3:\n",
    "            chioutput[0].value = \"Error: input value missing\"\n",
    "            return\n",
    "    try:\n",
    "        molar_mass = float(molar_mass_wdg.value)\n",
    "    except:\n",
    "        if chiinput[1].value >= 5 or chiinput[1].value >= 5:\n",
    "            chioutput[0].value = \"Error: input value missing\"\n",
    "            return\n",
    "        \n",
    "    if chiinput[1].value == 1: # volume SI\n",
    "        input_to_SI_adim = inv\n",
    "    if chiinput[1].value == 2: # volume CGS\n",
    "        input_to_SI_adim = inv*fourpi\n",
    "    if chiinput[1].value == 3: # mass SI\n",
    "        input_to_SI_adim = inv * density * 1.0E3\n",
    "    if chiinput[1].value == 4: # mass CGS\n",
    "        input_to_SI_adim = inv * density * fourpi\n",
    "    if chiinput[1].value == 5: # mol SI\n",
    "        input_to_SI_adim = inv * (density/molar_mass) * 1.0E6\n",
    "    if chiinput[1].value == 6: # mol SI\n",
    "        input_to_SI_adim = inv * (density/molar_mass) * fourpi\n",
    "\n",
    "    if chioutput[1].value == 1: # volume SI\n",
    "        outv = input_to_SI_adim\n",
    "    if chioutput[1].value == 2: # volume CGS\n",
    "        outv = input_to_SI_adim / fourpi\n",
    "    if chioutput[1].value == 3: # mass SI\n",
    "        outv = input_to_SI_adim / ( density * 1.0E3 )\n",
    "    if chioutput[1].value == 4: # mass CGS\n",
    "        outv = input_to_SI_adim / ( density * fourpi )\n",
    "    if chioutput[1].value == 5: # mol SI\n",
    "        outv = input_to_SI_adim /( (density/molar_mass) * 1.0E6)\n",
    "    if chioutput[1].value == 6: # mol SI\n",
    "        outv = input_to_SI_adim /( (density/molar_mass) * fourpi)\n",
    "    \n",
    "    chioutput[0].value = str(outv)\n",
    "        \n",
    "        \n",
    "def mk_btn(description):\n",
    "    btn = ipw.Button(description=description, layout=ipw.Layout(width=\"245px\"))\n",
    "    btn.on_click(on_click)\n",
    "    return btn\n",
    "\n",
    "\n",
    "row0 = ipw.HBox((ipw.Label('X in'), ) + chiinput)\n",
    "row1 = ipw.HBox((ipw.Label('X out'),) + chioutput)\n",
    "row2 = ipw.HBox((ipw.Label('Molar mass (g/mol)'), molar_mass_wdg, ipw.Label('Density (g/cm^3)'), density_wdg ))\n",
    "ipw.VBox((row0, row1, row2, mk_btn('Convert')))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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