Array-Rotate.ipynb

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   "source": [
    "import numpy as np # linear algebra"
   ]
  },
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      "init array\n",
      "[[0 1 2]\n",
      " [3 4 5]\n",
      " [6 7 8]]\n",
      "rotated array\n",
      "[[2 0 1]\n",
      " [5 3 4]\n",
      " [8 6 7]]\n"
     ]
    }
   ],
   "source": [
    "# 2D Array Rotation based on ariticle: https://stackoverflow.com/questions/19878280/efficient-way-to-shift-2d-matrices-in-both-directions/25628221 \n",
    "\n",
    "X = np.array([[0, 1, 2],\n",
    " [3, 4, 5],\n",
    " [6, 7, 8]])\n",
    "\n",
    "XR = np.roll(X, 1, axis=1) # right one\n",
    "\n",
    "print(\"init array\")\n",
    "print(X)\n",
    "print(\"rotated array\")\n",
    "print(XR)"
   ]
  },
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   "cell_type": "code",
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   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[5 1 2 3 4]\n",
      "[2 3 4 5 1]\n"
     ]
    }
   ],
   "source": [
    "import collections \n",
    "\n",
    "X = collections.deque([1, 2, 3, 4, 5])\n",
    "\n",
    "X.rotate(1)\n",
    "XR = np.array(X)\n",
    "print(XR)\n",
    "\n",
    "X.rotate(-2)\n",
    "XR = np.array(X)\n",
    "print(XR)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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