{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "46375879",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([6, 9, 6, 1, 1, 2, 8, 7, 3, 5, 6, 3, 5, 3, 5, 8, 8, 2, 8, 1, 7, 8,\n",
       "       7, 2, 1, 2, 9, 9, 4, 9])"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import numpy as np\n",
    "np.random.seed(1)\n",
    "X = np.random.randint(1, 10, size=30)\n",
    "X"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "cfef5028",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([[6, 9, 6],\n",
       "       [1, 1, 2],\n",
       "       [8, 7, 3],\n",
       "       [5, 6, 3],\n",
       "       [5, 3, 5],\n",
       "       [8, 8, 2],\n",
       "       [8, 1, 7],\n",
       "       [8, 7, 2],\n",
       "       [1, 2, 9],\n",
       "       [9, 4, 9]])"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "X.reshape(-1,3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "889f5953",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([[6, 9, 6],\n",
       "       [1, 1, 2],\n",
       "       [8, 7, 3],\n",
       "       [5, 6, 3],\n",
       "       [5, 3, 5],\n",
       "       [8, 8, 2],\n",
       "       [8, 1, 7],\n",
       "       [8, 7, 2],\n",
       "       [1, 2, 9],\n",
       "       [9, 4, 9]])"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "X1 = X.reshape(-1 ,3)\n",
    "X1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "b1ea483b",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([6, 2, 3, 3, 5, 2, 7, 2, 9, 9])"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "last1 = X1[:, 2]\n",
    "last1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "6f78cb93",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([False,  True,  True,  True, False,  True, False,  True, False,\n",
       "       False])"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "last1 <= 3"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "82645e95",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([2, 3, 3, 2, 2])"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# 返回符合条件的位置，位置以True False来表示\n",
    "temp1 = last1[last1 <= 3]\n",
    "temp1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "id": "213aa159",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "(array([1, 2, 3, 5, 7], dtype=int64),)"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# 返回符合条件的位置, 索引值\n",
    "np.where(last1 <= 3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "id": "34f4d363",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([6, 2, 3, 3, 5, 2, 7, 2, 9, 9])"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "last1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "id": "e4e5b5d1",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([6, 5])"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "temp2 =  last1[(last1 > 3) & (last1 <= 6)]\n",
    "temp2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "id": "907785bf",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([7, 9, 9])"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "temp3 =  last1[last1 > 6]\n",
    "temp3"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "id": "e8b3f707",
   "metadata": {},
   "outputs": [],
   "source": [
    "last1[last1 <= 3] = 0"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "id": "544de98e",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([6, 0, 0, 0, 5, 0, 7, 0, 9, 9])"
      ]
     },
     "execution_count": 15,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "last1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "id": "9a24a871",
   "metadata": {},
   "outputs": [],
   "source": [
    "last1[(last1 > 3) & (last1 <= 6)] = 1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "id": "ff0ca5ad",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([1, 0, 0, 0, 1, 0, 7, 0, 9, 9])"
      ]
     },
     "execution_count": 17,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "last1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "id": "ea1df168",
   "metadata": {},
   "outputs": [],
   "source": [
    "last1[last1 > 6] = 2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "id": "65f621ef",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([1, 0, 0, 0, 1, 0, 2, 0, 2, 2])"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "last1 "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "id": "dd098a15",
   "metadata": {},
   "outputs": [],
   "source": [
    "X_train = X1[:, 0:2]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "id": "b354e52b",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([[6, 9],\n",
       "       [1, 1],\n",
       "       [8, 7],\n",
       "       [5, 6],\n",
       "       [5, 3],\n",
       "       [8, 8],\n",
       "       [8, 1],\n",
       "       [8, 7],\n",
       "       [1, 2],\n",
       "       [9, 4]])"
      ]
     },
     "execution_count": 21,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "X_train"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "id": "cae0fb99",
   "metadata": {},
   "outputs": [],
   "source": [
    "y_train = last1\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "id": "bf9155e6",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([1, 0, 0, 0, 1, 0, 2, 0, 2, 2])"
      ]
     },
     "execution_count": 23,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "y_train"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "id": "481dc82b",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([[1, 1],\n",
       "       [8, 7],\n",
       "       [5, 6],\n",
       "       [8, 8],\n",
       "       [8, 7]])"
      ]
     },
     "execution_count": 24,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "X_train[y_train == 0] # 分类为0"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "id": "71ebf980",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([False,  True,  True,  True, False,  True, False,  True, False,\n",
       "       False])"
      ]
     },
     "execution_count": 25,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "y_train == 0"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "id": "088a88cd",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([[6, 9],\n",
       "       [5, 3]])"
      ]
     },
     "execution_count": 26,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "X_train[y_train == 1] # 分类为1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "id": "bc1ce97f",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([[8, 1],\n",
       "       [1, 2],\n",
       "       [9, 4]])"
      ]
     },
     "execution_count": 27,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "X_train[y_train == 2] # 分类为2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "ab8875ab",
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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