week5_2practice.ipynb

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   "source": [
    "### Week 5-2 NumPy Practice Problems"
   ]
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    "import numpy as np"
   ]
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   "source": [
    "### Warm up\n",
    "NumPy creation and indexing."
   ]
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   "source": [
    "# 1. Creates 3x3 array of zeros\n",
    "# YOUR CODE HERE"
   ]
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   "source": [
    "# 2. Creates array [0, 2, 4, 6, 8]\n",
    "# YOUR CODE HERE"
   ]
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   "source": [
    "# 3. 5 evenly spaced numbers from 0 to 1\n",
    "# YOUR CODE HERE"
   ]
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   "source": [
    "# Array indexing, Gets elements > 5\n",
    "arr = np.array([[1, 2, 3], \n",
    "                   [4, 5, 6], \n",
    "                   [7, 8, 9]])"
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   "source": [
    "### Problem 1\n",
    "Convert an array of Celsius measurements to Fahrenheit.\n",
    "Note: `fahrenheit = (Celsius * 9/5) + 32`."
   ]
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   "source": [
    "def convert_to_fahrenheit_list(temperatures):\n",
    "    # YOUR CODE HERE\n",
    "    raise NotImplementedError()"
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   "source": [
    "print(\"Testing with a regular list:\")\n",
    "temps_list = [0, 10, 20, 30]\n",
    "print(convert_to_fahrenheit_list(temps_list))"
   ]
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   "source": [
    "def convert_to_fahrenheit_numpy_array(temperatures):\n",
    "    # YOUR CODE HERE\n",
    "    raise NotImplementedError()"
   ]
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   "source": [
    "print(\"\\nTesting with a NumPy array:\")\n",
    "temps_array = np.array([0, 10, 20, 30])\n",
    "print(convert_to_fahrenheit_numpy_array(temps_array))"
   ]
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   "source": [
    "### Problem 2\n",
    "Use numpy to create a function that adds a border filled with zeros around an existing array.\n",
    "\n",
    "*Hint*: Use numpy's `pad` function. See https://numpy.org/doc/stable/reference/generated/numpy.pad.html\n",
    "\n",
    "Note: we did not cover this function in class, see if you are comfortable of reading numpy documents and learn on your own!"
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   "source": [
    "def add_border(x):\n",
    "    # YOUR CODE HERE\n",
    "    raise NotImplementedError()"
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    "x = np.ones((1, 1))\n",
    "claimed = add_border(x)\n",
    "correct = np.zeros((3, 3))\n",
    "correct[1, 1] = 1.0\n",
    "assert claimed.shape == correct.shape\n",
    "assert np.all(np.abs(claimed - correct) < 1e-8)"
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   "source": [
    "### Problem 3\n",
    "Create an $n \\times n$ numpy array filled with a checkerboard pattern of zeros and ones. The first entry should be the integer `0`. Assume $n \\ge 2$."
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   "source": [
    "def make_checkerboard(n):\n",
    "    # YOUR CODE HERE\n",
    "    raise NotImplementedError()"
   ]
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    "correct = \\\n",
    "    [[0, 1, 0, 1, 0, 1, 0, 1],\n",
    "     [1, 0, 1, 0, 1, 0, 1, 0],\n",
    "     [0, 1, 0, 1, 0, 1, 0, 1],\n",
    "     [1, 0, 1, 0, 1, 0, 1, 0],\n",
    "     [0, 1, 0, 1, 0, 1, 0, 1],\n",
    "     [1, 0, 1, 0, 1, 0, 1, 0],\n",
    "     [0, 1, 0, 1, 0, 1, 0, 1],\n",
    "     [1, 0, 1, 0, 1, 0, 1, 0]]\n",
    "assert np.all(correct == make_checkerboard(8))"
   ]
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   "source": [
    "import numpy as np\n",
    "x = np.arange(10)"
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