From 60c34c107f299c64ea9afc308daa3053a63516f7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pawe=C5=82=20Sk=C3=B3rzewski?= <pawel.skorzewski@amu.edu.pl>
Date: Thu, 30 Mar 2023 11:14:26 +0200
Subject: [PATCH] =?UTF-8?q?[L04]=20Zliczanie=20wyst=C4=85pie=C5=84=20NaN?=
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---
 lab/04_Reprezentacja_danych.ipynb | 42 ++++++++++++++++++++++++-------
 1 file changed, 33 insertions(+), 9 deletions(-)

diff --git a/lab/04_Reprezentacja_danych.ipynb b/lab/04_Reprezentacja_danych.ipynb
index 97cd2ca..b20dee8 100644
--- a/lab/04_Reprezentacja_danych.ipynb
+++ b/lab/04_Reprezentacja_danych.ipynb
@@ -28,7 +28,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": 1,
    "metadata": {},
    "outputs": [
     {
@@ -129,7 +129,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 2,
    "metadata": {},
    "outputs": [
     {
@@ -176,7 +176,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 3,
    "metadata": {},
    "outputs": [
     {
@@ -201,7 +201,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": 4,
    "metadata": {},
    "outputs": [
     {
@@ -229,7 +229,7 @@
        "Name: Piętro, dtype: int64"
       ]
      },
-     "execution_count": 8,
+     "execution_count": 4,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -260,7 +260,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 18,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [
     {
@@ -285,7 +285,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 19,
+   "execution_count": 6,
    "metadata": {},
    "outputs": [
     {
@@ -335,7 +335,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 20,
+   "execution_count": 7,
    "metadata": {},
    "outputs": [
     {
@@ -352,7 +352,7 @@
      "name": "stderr",
      "output_type": "stream",
      "text": [
-      "/tmp/ipykernel_11063/3804580172.py:1: RuntimeWarning: invalid value encountered in sqrt\n",
+      "/tmp/ipykernel_1089/3804580172.py:1: RuntimeWarning: invalid value encountered in sqrt\n",
       "  print(np.sqrt(-1))  # niezdefiniowany wynik działania (pierwiastek z liczby ujemnej)\n"
      ]
     }
@@ -387,6 +387,30 @@
     "* [What’s the best way to handle NaN values?](https://towardsdatascience.com/whats-the-best-way-to-handle-nan-values-62d50f738fc)"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Tak można policzyć, ile jest wartości NaN w danej kolumnie:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "2983\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(np.isnan(alldata[\"Rok budowy\"]).sum())"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},