remove populate indices and fix xticks

Author: reint-fischer

docs/user_guide/examples/tutorial_nemo_curvilinear.ipynb

@@ -207,9 +207,10 @@
     "ds = xr.open_zarr(\"output_curvilinear.zarr\")\n",
     "\n",
     "plt.plot(ds.lon.T, ds.lat.T, \".-\")\n",
-    "plt.vlines(np.arange(-180, 900, 360), -90, 90, color=\"r\", label=\"antimeridian\")\n",
+    "plt.vlines(np.arange(-180, 901, 360), -90, 90, color=\"r\", label=\"antimeridian\")\n",
     "plt.ylabel(\"Latitude [deg N]\")\n",
     "plt.xlabel(\"Longitude [deg E]\")\n",
+    "plt.xticks(np.arange(-180, 901, 90))\n",
     "plt.legend(loc=\"lower right\")\n",
     "plt.show()"
    ]
@@ -275,52 +276,20 @@
     "ax[0].vlines(np.arange(-180, 360, 360), -90, 90, color=\"r\", label=\"antimeridian\")\n",
     "ax[0].set_ylabel(\"Latitude [deg N]\")\n",
     "ax[0].set_xlabel(\"Longitude [deg E]\")\n",
+    "ax[0].set_xticks(np.arange(-180, 181, 45))\n",
     "ax[0].set_title(\"in post processing\")\n",
     "ax[0].legend(loc=\"lower center\")\n",
     "\n",
     "ax[1].plot(ds_periodic.lon.T, ds_periodic.lat.T, \".-\")\n",
     "ax[1].vlines(np.arange(-180, 360, 360), -90, 90, color=\"r\", label=\"antimeridian\")\n",
     "ax[1].set_ylabel(\"Latitude [deg N]\")\n",
     "ax[1].set_xlabel(\"Longitude [deg E]\")\n",
+    "ax[1].set_xticks(np.arange(-180, 181, 45))\n",
     "ax[1].set_title(\"with periodic Kernel\")\n",
     "ax[1].legend(loc=\"lower center\")\n",
     "\n",
     "plt.show()"
    ]
-  },
-  {
-   "attachments": {},
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "## Speeding up `ParticleSet` initialisation by efficiently finding particle start-locations on the `Grid`\n",
-    "\n",
-    "On a Curvilinear grid, determining the location of all `particles` on the grid is more complicated and therefore takes longer than on a Rectilinear grid. Since Parcels version 2.2.2, a function is available on the `ParticleSet` class, that speeds up the look-up. After creating the `ParticleSet`, but before running the `ParticleSet.execute()`, simply call the function `ParticleSet.populate_indices()`.\n"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "pset = parcels.ParticleSet(fieldset, lon=lonp, lat=latp)\n",
-    "pset.populate_indices()"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "For this speed-up to remain in effect while evaluating a `parcels.Field` in a `Kernel`, we need to remember to pass the `particles` object in the square brackets, by using one of:\n",
-    "```\n",
-    "particles.P = fieldset.P[particles]\n",
-    "```\n",
-    "or\n",
-    "```\n",
-    "particles.P = fieldset.P[particles.time, particles.z, particles.lat, particles.lon, particles]\n",
-    "```"
-   ]
   }
  ],
  "metadata": {