[doc] add example

doc/C2pyMagicDemo_nda.ipynb

@@ -0,0 +1,70 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "eb187f68-7c62-4561-89a4-d8f0d10c2f32",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "%load_ext clair.c2py_magic"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "5cdfac15-114f-423c-8caa-5ed7aa5c4faa",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import clair.compiler as C\n",
+    "C.compile_instructions['nda'] = C.ClangInvocation(env_preamble = \"source $HOME/nda_install/share/nda/ndavars.sh\", cpp_preamble = \"#include <nda/nda.hpp>\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "7f1865b8-2ff3-459b-806b-58a21dbb124b",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "%%c2py -C nda\n",
+    "int f(nda::array<double,1> const & x) { \n",
+    "return x[0];}"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "2a36f64c-0a85-4d83-880e-1bcd2fe6d75d",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import numpy as np\n",
+    "a = np.array([13,2])\n",
+    "print(f(a))"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "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": "3.12.2"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}