colab fix

Author: ice91

notebooks/20_flux_ratio.ipynb

@@ -26,15 +26,24 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "import numpy as np, matplotlib.pyplot as plt\n",
+    "import numpy as np\n",
+    "import matplotlib.pyplot as plt\n",
     "from palatini_pt.equivalence.flux_ratio import flux_ratio_FRW\n",
     "\n",
+    "# （可選）為了 Colab 更保險，明確指定使用 mathtext 而不是外部 TeX\n",
+    "import matplotlib as mpl\n",
+    "mpl.rcParams[\"text.usetex\"] = False\n",
+    "mpl.rcParams[\"mathtext.fontset\"] = \"stix\"     # or 'dejavusans'\n",
+    "mpl.rcParams[\"font.family\"] = \"STIXGeneral\"   # 視字型可用性而定\n",
+    "\n",
     "R = np.linspace(5.0, 80.0, 60)\n",
     "out = flux_ratio_FRW(R, {\"flux\": {\"sigma\": 1.0, \"c\": 0.5}})\n",
     "plt.plot(out[\"R\"], out[\"R_DBI_CM\"])\n",
     "plt.axhline(1.0, ls=\"--\")\n",
-    "plt.xlabel(\"R\"); plt.ylabel(r\"$\\mathcal R_{X/Y}$\")\n",
-    "plt.title(\"Flux ratio → 1 with $R^{-\\sigma}$ tail\")\n",
+    "plt.xlabel(\"R\")\n",
+    "plt.ylabel(r\"$\\mathcal{R}_{X/Y}$\")                 # <— 加上大括號\n",
+    "plt.title(r\"Flux ratio → 1 with $R^{-\\sigma}$ tail\")  # <— 用 raw string\n",
+    "plt.tight_layout()\n",
     "plt.show()"
    ]
   }