NumPyWorks_2.ipynb

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   "source": [
    "### 0. Declarations"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "id": "efe23c63",
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "acd4f00b",
   "metadata": {},
   "source": [
    " "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "id": "5b9fb414",
   "metadata": {},
   "outputs": [],
   "source": [
    "a = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "id": "4cd94074",
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "2"
      ]
     },
     "execution_count": 13,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a.ndim"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "id": "87a47905",
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "(3, 3)"
      ]
     },
     "execution_count": 12,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a.shape"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "b5603fbc",
   "metadata": {},
   "source": [
    " "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "id": "7a33a0b5",
   "metadata": {},
   "outputs": [],
   "source": [
    "b = np.array([[[3, 6, 9], [1, 2, 3]], [[2, 4, 6], [1, 2, 3]]])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "id": "a7c3f500",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "3"
      ]
     },
     "execution_count": 18,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "b.ndim"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "id": "67cb1a19",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "(2, 2, 3)"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "b.shape"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "8456f52e",
   "metadata": {},
   "source": [
    "### 1. Accessing Elements\n",
    "We can get a spesific element as *[row, column]*.<br>\n",
    "If its dimension is higher than 2, we can get as *[dim1, dim2, dim3, ...]*."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "id": "6dcacd9e",
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "6"
      ]
     },
     "execution_count": 14,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a[1, 2]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 34,
   "id": "185fb82d",
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "6"
      ]
     },
     "execution_count": 34,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "b[1, 0, 2]"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "472bab9d",
   "metadata": {},
   "source": [
    "### 2. Accessing Rows and Columns\n",
    "We can get a spesific row as *[row, :]*.<br>\n",
    "We can get a spesific column as *[:, column]*.<br>\n",
    "\"*:*\" stands for all items in the array."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "id": "c5130deb",
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([7, 8, 9])"
      ]
     },
     "execution_count": 15,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a[2, :]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "id": "3f03a08a",
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([3, 6, 9])"
      ]
     },
     "execution_count": 16,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a[:, 2]"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "9de876f5",
   "metadata": {},
   "source": [
    "We can get a range of a row or column as \"*start_index:end_index*\" (end index is not included)."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 37,
   "id": "e211eac3",
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([4, 5])"
      ]
     },
     "execution_count": 37,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a[1, 0:2]"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "7ac6c5dc",
   "metadata": {},
   "source": [
    "### 3. Updating Elements, Rows and Columns\n",
    "We can update an element using assignment operator \"*=*\"."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 40,
   "id": "a67ccb6f",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([[ 1,  2,  3],\n",
       "       [ 4,  5, -1],\n",
       "       [ 7,  8,  9]])"
      ]
     },
     "execution_count": 40,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a[1, 2] = -1\n",
    "a"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 43,
   "id": "3de82267",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([[ 1,  2,  3],\n",
       "       [-1, -1, -1],\n",
       "       [ 7,  8,  9]])"
      ]
     },
     "execution_count": 43,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a[1] = [-1, -1, -1]\n",
    "a"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 51,
   "id": "b916a0dc",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([[[ 3,  6,  9],\n",
       "        [ 1,  2,  3]],\n",
       "\n",
       "       [[ 2, -1,  6],\n",
       "        [ 1, -1,  3]]])"
      ]
     },
     "execution_count": 51,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "b[1, :, 1] = [-1, -1]\n",
    "b"
   ]
  }
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