UW28 blog post demo1

demo.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The closest particle has index [[1]] and coord [[[ 0.4  0.4]]].\n"
     ]
    }
   ],
   "source": [
    "import underworld as uw\n",
    "import numpy as np\n",
    "mesh = uw.mesh.FeMesh_Cartesian(maxCoord=(2.,1.))\n",
    "swarm = uw.swarm.Swarm(mesh)\n",
    "# add some particles at known locations\n",
    "part_coords = [(0.1,0.1),\n",
    "               (0.4,0.4),\n",
    "               (0.9,0.9),\n",
    "               (1.0,0.1),\n",
    "               (1.9,0.1)]\n",
    "swarm.add_particles_with_coordinates( np.array(part_coords) )\n",
    "# let's create a variable to record the particles local index\n",
    "index_var = swarm.add_variable('int',1)\n",
    "index_var.data[:,0] = np.arange(swarm.particleLocalCount)\n",
    "# now evaluate in the centre of the domain\n",
    "result = index_var.evaluate( (0.5,0.5) )\n",
    "# we expect the 1th particle (counting starts from 0) with coord (0.4,0.4)\n",
    "# to be the closest particle.. let's check\n",
    "print(\"The closest particle has index {} and coord {}.\".format(result,swarm.data[result]))"
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.5.3"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}