Solution/Day_05_Solution_v2.ipynb

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    "# [作業目標]\n",
    "\n",
    "1. 產生一個 1-11 的一維陣列，並且把 3-6 由正數變成負數。\n",
    "2. 試著從一個隨機陣列中，找出比 0.5 大的數有幾個？\n",
    "\n"
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   "source": [
    "# 作業 "
   ]
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   "source": [
    "### 1. 產生一個 1-11 的一維陣列，並且把 3-6 由正數變成負數。\n",
    "\n"
   ]
  },
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   "source": [
    "# 記得先 Import 正確的套件\n",
    "\n",
    "import numpy as np\n"
   ]
  },
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     "name": "stdout",
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     "text": [
      "[ 1  2 -3 -4 -5 -6  7  8  9 10 11]\n"
     ]
    }
   ],
   "source": [
    "Z = np.arange(11)+1\n",
    "\n",
    "Z[(3 <= Z) & (Z < 7)] *= -1\n",
    "print(Z)"
   ]
  },
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   "source": [
    "### 2. 試著從一個隨機陣列中，找出比 0.5 大的數有幾個？\n",
    "\n"
   ]
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     "text": [
      "6\n"
     ]
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   "source": [
    "A = np.random.rand(3, 6)\n",
    "\n",
    "print(A[A > 0.5].size)"
   ]
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