Update tutorial_interpolation.ipynb

Now that interpolators are functions (since #2646)

Author: erikvansebille

docs/user_guide/examples/tutorial_interpolation.ipynb

@@ -5,8 +5,8 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# 🖥️ Using `parcels.interpolators`\n",
-    "Parcels comes with a number of different interpolation methods for fields on structured (`X`) and unstructured (`Ux`) grids. Here, we will look at a few common {py:obj}`parcels.interpolators` for tracer fiedls, and how to configure them in an idealised example. For more guidance on the sampling of such fields, check out the [sampling tutorial](./tutorial_sampling)."
+    "# 🖥️ Using the built-in `parcels.interpolators`\n",
+    "Parcels comes with a number of different interpolation methods for fields on structured (`X`) and unstructured (`Ux`) grids. Here, we will look at a few common {py:obj}`parcels.interpolators` for tracer fields, and how to configure them in an idealised example. For more guidance on the sampling of such fields, check out the [sampling tutorial](./tutorial_sampling)."
    ]
   },
   {
@@ -72,7 +72,7 @@
    "source": [
     "fieldset = parcels.FieldSet.from_sgrid_conventions(ds, mesh=\"flat\")\n",
     "\n",
-    "assert fieldset.P.interp_method == parcels.interpolators.XLinear"
+    "assert isinstance(fieldset.P.interp_method, parcels.interpolators.XLinear)"
    ]
   },
   {
@@ -124,18 +124,18 @@
     "    XNearest,\n",
     ")\n",
     "\n",
-    "interp_methods = [XLinear, XLinearInvdistLandTracer, XNearest, CGrid_Tracer]\n",
+    "interp_methods = [XLinear(), XLinearInvdistLandTracer(), XNearest(), CGrid_Tracer()]\n",
     "for p_interp in interp_methods:\n",
     "    fieldset.P.interp_method = (\n",
     "        p_interp  # setting the interpolation method for fieldset.P\n",
     "    )\n",
     "\n",
-    "    print(fieldset.P.interp_method.__name__)\n",
+    "    print(fieldset.P.interp_method)\n",
     "    xv, yv = np.meshgrid(np.linspace(0, 1, 8), np.linspace(0, 1, 8))\n",
-    "    pset[p_interp.__name__] = parcels.ParticleSet(\n",
+    "    pset[p_interp.__class__.__name__] = parcels.ParticleSet(\n",
     "        fieldset, pclass=SampleParticle, lon=xv.flatten(), lat=yv.flatten()\n",
     "    )\n",
-    "    pset[p_interp.__name__].execute(\n",
+    "    pset[p_interp.__class__.__name__].execute(\n",
     "        SampleP,\n",
     "        runtime=np.timedelta64(1, \"D\"),\n",
     "        dt=np.timedelta64(1, \"D\"),\n",
@@ -188,10 +188,6 @@
     "\n",
     "For `interp_method='XNearest'`, the particle values are the same for all particles in a grid cell. They are also the same for `interp_method='CGrid_Tracer'`, but the grid cells have then shifted. That is because in a C-grid, the tracer is defined on the corners of the velocity grid (black dashed lines in right-most panel).\n",
     "\n",
-    "```{note}\n",
-    "TODO: check C-grid indexing after implementation in v4\n",
-    "```\n",
-    "\n",
     "For `interp_method='XLinearInvdistLandTracer'`, we see that values are the same as `interp_method='XLinear'` for grid cells that don't border the land point. For grid cells that do border the land cell, the `XLinearInvdistLandTracer` interpolation method gives higher values, as also shown in the difference plot below.\n"
    ]
   },
@@ -462,7 +458,8 @@
     "ax[1].set_aspect(\"equal\", \"box\")\n",
     "ax[1].set_xlabel(\"x\")\n",
     "ax[1].set_ylabel(\"y\")\n",
-    "ax[1].set_title(\"Face Registered Data\")"
+    "ax[1].set_title(\"Face Registered Data\")\n",
+    "plt.show()"
    ]
   },
   {
@@ -483,7 +480,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "test-notebooks",
+   "display_name": "Parcels:docs (3.14.6)",
    "language": "python",
    "name": "python3"
   },
@@ -497,7 +494,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.13.9"
+   "version": "3.14.6"
   }
  },
  "nbformat": 4,