026_Python_Math_edited.ipynb

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   "source": [
    "#### Math"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "id": "_fzw-I-wVWyH"
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   "source": [
    "Python มี Bulit-in Math function ให้ใช้หลายตัว และมี Math Module ที่รวบรวมชุดคำสั่งเกี่ยวกับงานด้านคณิตศาสตร์ไว้ให้เลือกใช้ได้โดยสะดวก"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "id": "ivayp-vFcY1x"
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   "source": [
    "###### Built-in Math Functions"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "id": "D1qUO64dcgy2"
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   "source": [
    "สามารถใช้ฟังก์ชั่น min() และ max() functions เพื่อใช้หาค่าต่ำสุด หรือ ค่าสูงสุดใน iterable ต่าง ๆ "
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     "name": "stdout",
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     "text": [
      "2\n",
      "52\n"
     ]
    }
   ],
   "source": [
    "x = min(2, 80, 21)\r\n",
    "y = max(52, 50, 51)\r\n",
    "\r\n",
    "print(x)\r\n",
    "print(y)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "id": "-KySOu_xPceq"
   },
   "source": [
    "ฟังก์ชั่น abs() ใช้ในการหาค่าสัมบูรณ์ (absolute value) ของตัวเลข"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
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   "outputs": [
    {
     "name": "stdout",
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     "text": [
      "3.14\n"
     ]
    }
   ],
   "source": [
    "x = abs(-3.14)\r\n",
    "\r\n",
    "print(x)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "id": "i3AKc26-PjoD"
   },
   "source": [
    "ฟังก์ชั่น pow(x, y) ใช้ในการหาค่าของ x ยกกำลัง y (x^y)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
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   "outputs": [
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     "text": [
      "256\n"
     ]
    }
   ],
   "source": [
    "x = pow(16, 2)\r\n",
    "\r\n",
    "print(x)"
   ]
  },
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   "cell_type": "markdown",
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    "id": "hL3CXZNMcnue"
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   "source": [
    "###### math module"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "id": "46_w8kYjcsE0"
   },
   "source": [
    "Python ยังมี built-in math module ให้เลือกใช้ โดยเป็นการรวบรวมชุดคำสั่งทานคณิตศาสตร์ต่าง ๆ ไว้มากมาย\r\n",
    "\r\n",
    "การจะใช้งาน math module ต้อง import module เข้ามาก่อน ตาม code ข้างล่าง"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {
    "id": "d1vaE2zXcuTp"
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   "outputs": [],
   "source": [
    "import math"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "id": "8GJ3c4DmcvDj"
   },
   "source": [
    "หลังจากที่ import math module เข้ามาแล้ว ก็สามารถเริ่มต้นใช้งาน method และค่าคงที่ทางคณิตศาสตร์ต่าง ๆ ที่กำหนดค่าไว้ใน module ได้เลย\r\n",
    "\r\n",
    "math.sqrt() เป็น method ที่ใช้ในการหาค่ารากที่สองของตัวเลข"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
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   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "25.0\n"
     ]
    }
   ],
   "source": [
    "import math\r\n",
    "\r\n",
    "x = math.sqrt(625)\r\n",
    "\r\n",
    "print(x)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "id": "flufVf1zS64C"
   },
   "source": [
    "math.ceil() เป็น method ที่ใช้ในการปัดเศษทศนิยมขึ้น ได้ผลลัพธ์เป็นจำนวนเต็ม \r\n",
    "\r\n",
    "math.floor() เป็น method ที่ใช้ในการปัดเศษทศนิยมลง ได้ผลลัพธ์เป็นจำนวนเต็ม"
   ]
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   "cell_type": "code",
   "execution_count": 14,
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     "timestamp": 1630398326329,
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   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "4\n",
      "7\n"
     ]
    }
   ],
   "source": [
    "import math\r\n",
    "\r\n",
    "x = math.ceil(3.14)\r\n",
    "y = math.floor(7.92)\r\n",
    "\r\n",
    "print(x) # returns 4\r\n",
    "print(y) # returns 7"
   ]
  },
  {
   "cell_type": "markdown",
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    "id": "AJWEJEJKTA9P"
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   "source": [
    "math.pi เป็นค่าคงที่ทางคณิตศาสตร์ ได้ผลลัพธ์เป็นค่า Pi (3.14...)"
   ]
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   "outputs": [
    {
     "name": "stdout",
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     "text": [
      "3.141592653589793\n"
     ]
    }
   ],
   "source": [
    "import math\r\n",
    "\r\n",
    "x = math.pi\r\n",
    "\r\n",
    "print(x)"
   ]
  }
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