Refactor code for improved readability and consistency across multiple Jupyter notebooks

- Added missing commas in various print statements and function calls for better syntax.
- Reformatted code to enhance clarity, including breaking long lines and aligning parameters.
- Updated function signatures to use float type for sigma parameters instead of int for better precision.
- Cleaned up comments and documentation strings for clarity and consistency.
- Ensured consistent formatting in plotting functions and data handling.

M1/Numerical Optimisation/ComputerSession1.ipynb

@@ -682,7 +682,7 @@
     "        [\n",
     "            (F(x + delta * e(i, d)) - F(x - delta * e(i, d))) / (2 * delta)\n",
     "            for i in range(d)\n",
-    "        ]\n",
+    "        ],\n",
     "    )\n",
     "\n",
     "\n",