diff --git a/PCP.html b/PCP.html
index 2f3ba97..45a6c1c 100644
--- a/PCP.html
+++ b/PCP.html
@@ -13124,7 +13124,7 @@ <h1 id="Overview">Overview<a class="anchor-link" href="#Overview">&#182;</a></h1
 Meinard Müller and Sebastian Rosenzweig: <strong>PCP Notebooks: A Preparation Course for Python with a Focus on Signal Processing.</strong> The Journal of Open Source Education (JOSE), 2021.
 <br>
 <a type="button" class="btn btn-default btn-xs" target="_blank" href="data/PCP_bibtex_MuellerR21_PCP_JOSE.txt"> Bibtex </a>
-<a type="button" class="btn btn-default btn-xs" target="_blank" href="data/2021_MuellerR_PCP_JOSE_tobesubmitted.pdf"> PDF </a> 
+<a type="button" class="btn btn-default btn-xs" target="_blank" href="data/2021_MuellerR_PCP_JOSE.pdf"> PDF </a> 
 <a type="button" class="btn btn-default btn-xs" target="_blank" href="https://github.com/meinardmueller/PCP"> GitHub </a>     
 </li>
 </ul>       
diff --git a/PCP.ipynb b/PCP.ipynb
index 77d61a3..144ba7e 100644
--- a/PCP.ipynb
+++ b/PCP.ipynb
@@ -46,7 +46,7 @@
     "Meinard Müller and Sebastian Rosenzweig: <strong>PCP Notebooks: A Preparation Course for Python with a Focus on Signal Processing.</strong> The Journal of Open Source Education (JOSE), 2021.\n",
     "<br>\n",
     "<a type=\"button\" class=\"btn btn-default btn-xs\" target=\"_blank\" href=\"data/PCP_bibtex_MuellerR21_PCP_JOSE.txt\"> Bibtex </a>\n",
-    "<a type=\"button\" class=\"btn btn-default btn-xs\" target=\"_blank\" href=\"data/2021_MuellerR_PCP_JOSE_tobesubmitted.pdf\"> PDF </a> \n",
+    "<a type=\"button\" class=\"btn btn-default btn-xs\" target=\"_blank\" href=\"data/2021_MuellerR_PCP_JOSE.pdf\"> PDF </a> \n",
     "<a type=\"button\" class=\"btn btn-default btn-xs\" target=\"_blank\" href=\"https://github.com/meinardmueller/PCP\"> GitHub </a>     \n",
     "</li>\n",
     "</ul>       \n",
diff --git a/PCP_02_python.html b/PCP_02_python.html
index b741601..7cea4b3 100644
--- a/PCP_02_python.html
+++ b/PCP_02_python.html
@@ -13991,9 +13991,9 @@ <h2 id="Shallow-and-Deep-Copy-Operations">Shallow and Deep Copy Operations<a cla
 
 
 <div class="output_subarea output_stream output_stdout output_text">
-<pre>a =  [1, 2, 3] , id(a) =  140332349275344
-b =  [0, 2, 3, 4] , id(b) =  140332349275344
-a =  [0, 2, 3, 4] , id(a) =  140332349275344
+<pre>a =  [1, 2, 3] , id(a) =  140524003941104
+b =  [0, 2, 3, 4] , id(b) =  140524003941104
+a =  [0, 2, 3, 4] , id(a) =  140524003941104
 </pre>
 </div>
 </div>
diff --git a/PCP_02_python.ipynb b/PCP_02_python.ipynb
index dbef501..59326de 100644
--- a/PCP_02_python.ipynb
+++ b/PCP_02_python.ipynb
@@ -779,9 +779,9 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "a =  [1, 2, 3] , id(a) =  140332349275344\n",
-      "b =  [0, 2, 3, 4] , id(b) =  140332349275344\n",
-      "a =  [0, 2, 3, 4] , id(a) =  140332349275344\n"
+      "a =  [1, 2, 3] , id(a) =  140524003941104\n",
+      "b =  [0, 2, 3, 4] , id(b) =  140524003941104\n",
+      "a =  [0, 2, 3, 4] , id(a) =  140524003941104\n"
      ]
     }
    ],
diff --git a/PCP_03_numpy.html b/PCP_03_numpy.html
index 44b4fcd..ea49b59 100644
--- a/PCP_03_numpy.html
+++ b/PCP_03_numpy.html
@@ -13301,8 +13301,8 @@ <h2 id="NumPy-Arrays">NumPy Arrays<a class="anchor-link" href="#NumPy-Arrays">&#
  [1. 1. 1.]]
 Evenly spaced values within a given interval:  [2 4 6]
 Random values in a given shape: 
-[[0.13600722 0.08576738 0.0503262 ]
- [0.93272723 0.06890308 0.99498775]]
+[[0.63882794 0.91877575 0.1844543 ]
+ [0.17841392 0.86993592 0.63250531]]
 Identity matrix: 
 [[1. 0. 0.]
  [0. 1. 0.]
@@ -14061,8 +14061,8 @@ <h2 id="Exercises-and-Results">Exercises and Results<a class="anchor-link" href=
 [16 15 14  6  5  4  0] Type: &lt;class &#39;numpy.ndarray&#39;&gt;
 [16 15 14  6  5  4  0] Type: &lt;class &#39;numpy.ndarray&#39;&gt;
 [16 15 14  6  5  4  0] Type: &lt;class &#39;numpy.ndarray&#39;&gt;
-&lt;reversed object at 0x7fdf321d3290&gt; Type: &lt;class &#39;reversed&#39;&gt;
-&lt;reversed object at 0x7fdf31da4b90&gt; Type: &lt;class &#39;reversed&#39;&gt;
+&lt;reversed object at 0x7f8783a5f410&gt; Type: &lt;class &#39;reversed&#39;&gt;
+&lt;reversed object at 0x7f8783a5fdd0&gt; Type: &lt;class &#39;reversed&#39;&gt;
 </pre>
 </div>
 </div>
diff --git a/PCP_03_numpy.ipynb b/PCP_03_numpy.ipynb
index db2cf5f..e236d7c 100644
--- a/PCP_03_numpy.ipynb
+++ b/PCP_03_numpy.ipynb
@@ -192,8 +192,8 @@
       " [1. 1. 1.]]\n",
       "Evenly spaced values within a given interval:  [2 4 6]\n",
       "Random values in a given shape: \n",
-      "[[0.13600722 0.08576738 0.0503262 ]\n",
-      " [0.93272723 0.06890308 0.99498775]]\n",
+      "[[0.63882794 0.91877575 0.1844543 ]\n",
+      " [0.17841392 0.86993592 0.63250531]]\n",
       "Identity matrix: \n",
       "[[1. 0. 0.]\n",
       " [0. 1. 0.]\n",
@@ -864,8 +864,8 @@
       "[16 15 14  6  5  4  0] Type: <class 'numpy.ndarray'>\n",
       "[16 15 14  6  5  4  0] Type: <class 'numpy.ndarray'>\n",
       "[16 15 14  6  5  4  0] Type: <class 'numpy.ndarray'>\n",
-      "<reversed object at 0x7fdf321d3290> Type: <class 'reversed'>\n",
-      "<reversed object at 0x7fdf31da4b90> Type: <class 'reversed'>\n"
+      "<reversed object at 0x7f8783a5f410> Type: <class 'reversed'>\n",
+      "<reversed object at 0x7f8783a5fdd0> Type: <class 'reversed'>\n"
      ]
     }
    ],
diff --git a/PCP_04_control.html b/PCP_04_control.html
index 9e63e60..c66522b 100644
--- a/PCP_04_control.html
+++ b/PCP_04_control.html
@@ -13685,9 +13685,9 @@ <h2 id="Efficiency-and-Runtime">Efficiency and Runtime<a class="anchor-link" hre
 <pre>Computation with sum_n:       n=1000, s=500500
 Computation with sum_n_numpy: n=1000, s=500500
 Computation with sum_n_math:  n=1000, s=500500
-Runtime for sum_n: 0.552015 ms
-Runtime for sum_n_numpy: 0.023065 ms
-Runtime for sum_n_math: 0.000307 ms
+Runtime for sum_n: 0.546106 ms
+Runtime for sum_n_numpy: 0.024173 ms
+Runtime for sum_n_math: 0.000305 ms
 </pre>
 </div>
 </div>
@@ -13777,7 +13777,7 @@ <h2 id="Exercises-and-Results">Exercises and Results<a class="anchor-link" href=
 <pre>default:    nan
 s=&#39;large&#39;:  1267650600228229401496703205376
 s=&#39;small&#39;:  7.888609052210118e-31
-s=&#39;random&#39;: 0.08775106776289154
+s=&#39;random&#39;: 0.33183307431484765
 s=&#39;test&#39;:   nan
 </pre>
 </div>
diff --git a/PCP_04_control.ipynb b/PCP_04_control.ipynb
index 81f6752..de602a6 100644
--- a/PCP_04_control.ipynb
+++ b/PCP_04_control.ipynb
@@ -494,9 +494,9 @@
       "Computation with sum_n:       n=1000, s=500500\n",
       "Computation with sum_n_numpy: n=1000, s=500500\n",
       "Computation with sum_n_math:  n=1000, s=500500\n",
-      "Runtime for sum_n: 0.552015 ms\n",
-      "Runtime for sum_n_numpy: 0.023065 ms\n",
-      "Runtime for sum_n_math: 0.000307 ms\n"
+      "Runtime for sum_n: 0.546106 ms\n",
+      "Runtime for sum_n_numpy: 0.024173 ms\n",
+      "Runtime for sum_n_math: 0.000305 ms\n"
      ]
     }
    ],
@@ -631,7 +631,7 @@
       "default:    nan\n",
       "s='large':  1267650600228229401496703205376\n",
       "s='small':  7.888609052210118e-31\n",
-      "s='random': 0.08775106776289154\n",
+      "s='random': 0.33183307431484765\n",
       "s='test':   nan\n"
      ]
     }
diff --git a/PCP_06_complex.ipynb b/PCP_06_complex.ipynb
index ab92e2e..bbf7e2c 100644
--- a/PCP_06_complex.ipynb
+++ b/PCP_06_complex.ipynb
@@ -810,7 +810,7 @@
        "        "
       ],
       "text/plain": [
-       "<IPython.lib.display.YouTubeVideo at 0x7fe5b6a74990>"
+       "<IPython.lib.display.YouTubeVideo at 0x7fa526d72610>"
       ]
      },
      "metadata": {},
diff --git a/PCP_08_signal.ipynb b/PCP_08_signal.ipynb
index 00dbeb8..2ffb1d5 100644
--- a/PCP_08_signal.ipynb
+++ b/PCP_08_signal.ipynb
@@ -881,7 +881,7 @@
        "        "
       ],
       "text/plain": [
-       "<IPython.lib.display.YouTubeVideo at 0x7fec836e0dd0>"
+       "<IPython.lib.display.YouTubeVideo at 0x7fcd4fc5d790>"
       ]
      },
      "metadata": {},
diff --git a/PCP_09_dft.html b/PCP_09_dft.html
index 06c1895..9a22e7c 100644
--- a/PCP_09_dft.html
+++ b/PCP_09_dft.html
@@ -13794,11 +13794,11 @@ <h2 id="Fast-Fourier-Transform-(FFT)">Fast Fourier Transform (FFT)<a class="anch
 
 
 <div class="output_subarea output_stream output_stdout output_text">
-<pre>Runtime (ms) for N =  256 : DFT       7.02,  FFT 0.00850,  FFT_np 0.00000556
-Runtime (ms) for N =  512 : DFT      13.42,  FFT 0.01647,  FFT_np 0.00000466
-Runtime (ms) for N = 1024 : DFT      45.33,  FFT 0.03312,  FFT_np 0.00000607
-Runtime (ms) for N = 2048 : DFT     169.02,  FFT 0.06671,  FFT_np 0.00001244
-Runtime (ms) for N = 4096 : DFT     737.80,  FFT 0.13382,  FFT_np 0.00001711
+<pre>Runtime (ms) for N =  256 : DFT       4.46,  FFT 0.00945,  FFT_np 0.00000682
+Runtime (ms) for N =  512 : DFT      14.19,  FFT 0.01898,  FFT_np 0.00000476
+Runtime (ms) for N = 1024 : DFT      45.43,  FFT 0.03833,  FFT_np 0.00000666
+Runtime (ms) for N = 2048 : DFT     170.61,  FFT 0.07642,  FFT_np 0.00000926
+Runtime (ms) for N = 4096 : DFT     728.12,  FFT 0.15197,  FFT_np 0.00001818
 </pre>
 </div>
 </div>
diff --git a/PCP_09_dft.ipynb b/PCP_09_dft.ipynb
index f58ffc9..d4f99eb 100644
--- a/PCP_09_dft.ipynb
+++ b/PCP_09_dft.ipynb
@@ -717,11 +717,11 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Runtime (ms) for N =  256 : DFT       7.02,  FFT 0.00850,  FFT_np 0.00000556\n",
-      "Runtime (ms) for N =  512 : DFT      13.42,  FFT 0.01647,  FFT_np 0.00000466\n",
-      "Runtime (ms) for N = 1024 : DFT      45.33,  FFT 0.03312,  FFT_np 0.00000607\n",
-      "Runtime (ms) for N = 2048 : DFT     169.02,  FFT 0.06671,  FFT_np 0.00001244\n",
-      "Runtime (ms) for N = 4096 : DFT     737.80,  FFT 0.13382,  FFT_np 0.00001711\n"
+      "Runtime (ms) for N =  256 : DFT       4.46,  FFT 0.00945,  FFT_np 0.00000682\n",
+      "Runtime (ms) for N =  512 : DFT      14.19,  FFT 0.01898,  FFT_np 0.00000476\n",
+      "Runtime (ms) for N = 1024 : DFT      45.43,  FFT 0.03833,  FFT_np 0.00000666\n",
+      "Runtime (ms) for N = 2048 : DFT     170.61,  FFT 0.07642,  FFT_np 0.00000926\n",
+      "Runtime (ms) for N = 4096 : DFT     728.12,  FFT 0.15197,  FFT_np 0.00001818\n"
      ]
     }
    ],