Latex printing in SymPy

Latex printing in SymPy.ipynb

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      "text/latex": [
       "$$\\alpha = 0.856$$"
      ],
      "text/plain": [
       "α = 0.856"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import sympy as sp\n",
    "sp.init_printing()\n",
    "alpha = sp.symbols('alpha')\n",
    "eq = sp.Eq(alpha, 0.856)\n",
    "eq"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\\alpha = 0.856\n"
     ]
    }
   ],
   "source": [
    "print(sp.latex(eq))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Note that you can't just do the following, as it returns two \\ backslashes due to the need to escape one of them:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'\\\\alpha = 0.856'"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "sp.latex(eq)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "You could, however, output them into a file:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\\alpha = 0.856\n"
     ]
    }
   ],
   "source": [
    "with open(\"equations.tex\", \"w\") as f:\n",
    "    f.write(sp.latex(eq))\n",
    "with open(\"equations.tex\", \"r\") as f:\n",
    "    print(f.read())    "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\\alpha = 0.856"
     ]
    }
   ],
   "source": [
    "cat equations.tex"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "I just stumbled upon these options and they're pretty cool:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "$\\alpha = 0.856$\n",
      "\\begin{equation}\\alpha = 0.856\\end{equation}\n",
      "\\begin{equation*}\\alpha = 0.856\\end{equation*}\n"
     ]
    }
   ],
   "source": [
    "print(sp.latex(eq, mode='inline'))\n",
    "print(sp.latex(eq, mode='equation'))\n",
    "print(sp.latex(eq, mode='equation*'))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "alpha_i = 0.856\n"
     ]
    }
   ],
   "source": [
    "print(sp.latex(eq, symbol_names={alpha: \"alpha_i\"}))"
   ]
  }
 ],
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