diff -r 39c6b93718f0 -r 371acb50643d slides/slides03.tex
--- a/slides/slides03.tex	Fri Nov 24 01:26:01 2017 +0000
+++ b/slides/slides03.tex	Fri Nov 24 03:10:23 2017 +0000
@@ -2,7 +2,7 @@
 \usepackage{../slides}
 \usepackage{../graphics}
 \usepackage{../langs}
-%\usepackage{../data}
+%%\usepackage{../data}
 \usepackage[export]{adjustbox}
 
 \hfuzz=220pt 
@@ -21,9 +21,59 @@
 % beamer stuff 
 \renewcommand{\slidecaption}{PEP (Scala) 03, King's College London}
 
+\begin{filecontents}{re3a.data}
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+1000001 0.62752
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+2500001 1.68619
+3000001 1.94957
+3500001 2.15878
+4000001 2.59918
+4500001 5.90679
+5000001 13.11295
+5500001 19.15376
+6000001 40.16373
+\end{filecontents}
+\begin{filecontents}{re-python2.data}
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+22 0.485
+23 0.878
+24 1.71
+25 3.40
+26 7.08
+27 14.12
+28 26.69
+\end{filecontents}
+
+\begin{filecontents}{re-java.data}
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+25  3.36112
+26  6.63998
+27  13.35120
+28  29.81185
+\end{filecontents}
 
 \begin{document}
-
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[t]
 \frametitle{%
@@ -35,9 +85,11 @@
   \normalsize
   \begin{center}
   \begin{tabular}{ll}
-  Email:  & christian.urban at kcl.ac.uk\\
-  Office: & S1.27 (1st floor Strand Building)\\
-  Slides \& Code: & KEATS
+    Email:  & christian.urban at kcl.ac.uk\\
+    Office: & N7.07 (North Wing, Bush House)\\
+    Slides \& Code: & KEATS\medskip\\
+    Scala Office & \\
+    Hours: &  Thursdays 11 -- 13\\
   \end{tabular}
   \end{center}
 
@@ -45,181 +97,79 @@
 \end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
 
-\begin{frame}[c, fragile]
-\frametitle{The Joy of Immutability}
-
-\begin{itemize}
-\item If you need to manipulate some data in a list say, then you make
-  a new list with the updated values, rather than revise the original
-  list. Easy!\medskip
-
-  {\small
-  \begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]
-    val old_list = List(1, 2, 3, 5)
-    val new_list = 0 :: old_list
-  \end{lstlisting}}  
-  
-\item You do not have to be defensive about who can access the data
-  (concurrency, lazyness).
-\end{itemize}  
-\end{frame}
-
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\begin{frame}[t]
-\frametitle{Email: Hate 'val'}
-
-\mbox{}\\[-25mm]\mbox{}
-
-\begin{center}
-  \begin{bubble}[10.5cm]
-  Subject: \textbf{Hate '\textbf{\texttt{val}}'}\hfill 01:00 AM\medskip\\
-
-  Hello Mr Urban,\medskip\\
-
-  I just wanted to ask, how are we suppose to work
-  with the completely useless \textbf{\texttt{val}}, that can’t be changed ever? Why is
-  this rule active at all? I’ve spent 4 hours not thinking on the
-  coursework, but how to bypass this annoying rule. What’s the whole
-  point of all these coursework, when we can’t use everything Scala
-  gives us?!?\medskip\\
-
-  Regards.\\
-  \mbox{}\hspace{5mm}\textcolor{black!50}{<<deleted>>}\\
-  \end{bubble}
-\end{center}
-
-\end{frame}
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\begin{frame}[c]
-
-\mbox{}\\[-25mm]\mbox{}
-
-\begin{center}
-  \begin{bubble}[10.5cm]
-  Subject: \textbf{Re: Hate '\textbf{\texttt{val}}'}\hfill 01:02 AM\bigskip\bigskip\\
-
-  \textcolor{black!70}{
-    \textit{\large<<my usual rant about fp\ldots\\ concurrency bla bla\ldots{} better programs
-    yada>>}}\bigskip\bigskip\bigskip
-  
-  PS: What are you trying to do where you desperately want to use \texttt{var}?
-  \end{bubble}
-\end{center}
-
-\end{frame}
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[c,fragile]
 
 \begin{textblock}{6}(0.5,0.5)
 \begin{bubble}[11.5cm]
-  \small  
-  Subject: \textbf{Re: Re: Hate '\textbf{\texttt{val}}'}\hfill 01:04 AM\medskip\\
+\footnotesize
+\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]
+import java.util.concurrent._
+import java.util.concurrent.atomic._
 
-  \textbf{Right now my is\_legal function works fine:}
-  
-\footnotesize\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]
- def is_legal(dim: Int, path: Path)(x: Pos): Boolean = {
-   var boolReturn = false
-   if(x._1 > dim || x._2 > dim || x._1 < 0 || x._2 < 0) {
-   else { var breakLoop = false
-          if(path == Nil) { boolReturn = true }
-          else { for(i <- 0 until path.length) {
-                    if(breakLoop == false) {
-                      if(path(i) == x) {
-                        boolReturn = true
-                        breakLoop = true
-                      }
-                      else { boolReturn = false }
-                    } else breakLoop
+  def collatz(input:Int){
+          CollatzConjecture(input);
+          println(count.get());
+      }
+      def collatz_max(input:Int){
+          val List = new Array[Int](input)
+            for (i <- 0 to input-1){
+                CollaĵConjecture(i);
+                List(i)=count.get();
+                count.set(0);
             }
-          }
-          boolReturn
-   }
+            val max = new AtomicInteger();
+            max.set(List(0));
+            val index = new AtomicInteger();
+            index.set(1);
+ 
 \end{lstlisting}
 \end{bubble}
 \end{textblock}
 
-\begin{textblock}{6}(8.2,11.8)
-\begin{bubble}[5.5cm]\footnotesize\bf
-\ldots{}but I can’t make it work with boolReturn being val. What approach would
-you recommend in this case, and is using var in this case justified?
-\end{bubble}
-\end{textblock}
-
-\only<2>{
-\begin{textblock}{6}(0.3,11.8)
-  \begin{bubble}[3.1cm]
-    \textbf{Me:} \includegraphics[scale=0.08, valign=t]{../pics/throwup.jpg}
-  \end{bubble}
-\end{textblock}}
-
 \end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\begin{frame}[t,fragile]
-
-\mbox{}\\[-25mm]\mbox{}
+\begin{frame}[c,fragile]
 
-\begin{textblock}{6}(0.5,2)
-  \begin{bubble}[11.5cm]
-  Subject: \textbf{Re: Re: Re: Hate '\textbf{\texttt{val}}'}\hfill 01:06 AM\bigskip\\
-  \small
-  
-  OK. So you want to make sure that the \texttt{x}-position is not outside the
-  board....and furthermore you want to make sure that the \texttt{x}-position
-  is not yet in the path list. How about something like\bigskip
+\begin{textblock}{6}(0.5,0.5)
+\begin{bubble}[11.5cm]
+\footnotesize
+\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]
+             for(i<-0 to input-1){
+                val temp :Int=max.get();
+                if (temp < List(i)){
+                    max.set(List(i));
+                    index.set(i);
+                }
+            }
+            println("("+max.get() +","+ index.get()+ ")");
+      }
 
-\footnotesize\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]
- def is_legal(dim: Int, path: Path)(x: Pos): Boolean = 
- ...<<some board conditions>>... && !path.contains(x)
-\end{lstlisting}\bigskip
-  
-  \small Does not even contain a \texttt{val}.
-  \end{bubble}
-\end{textblock}
-
-\begin{textblock}{6}(7,12)
-\footnotesize\textcolor{black!50}{(This is all on one line)}
+      def CollatzConjecture(n: Long): Long = {
+        count.incrementAndGet();
+        if (n <= 1)
+            1
+        else if (n\%2 ==0)
+            CollatzConjecture(n/2);
+            else
+               CollatzConjecture((3*n)+1);
+   }
+ }
+\end{lstlisting}
+\end{bubble}
 \end{textblock}
 
 \end{frame}
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
-
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\begin{frame}[t,fragile]
-
-\mbox{}\\[-15mm]\mbox{}
-
-\begin{textblock}{6}(1,3)
-  \begin{bubble}[10.5cm]
-    Subject: \textbf{Re: Re: Re: Re: Hate '\textbf{\texttt{val}}'}\hfill 11:02 AM\bigskip\bigskip\\
-    
-    THANK YOU! You made me change my coding perspective. Because of you,
-    I figured out the next one\ldots
-  \end{bubble}
-\end{textblock}
-
-\only<2>{
-\begin{textblock}{6}(0.3,11.8)
-  \begin{bubble}[3.1cm]
-    \textbf{Me:} \includegraphics[scale=0.08]{../pics/happy.jpg}
-  \end{bubble}
-\end{textblock}}
-
-\end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
 
 
+
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[c]
-  \frametitle{CW3: Regexes (1 Part)}
+  \frametitle{CW3 (1 Part): Regexes}
   
 \begin{center}
   Graphs: $(a^*)^* b$ and strings $\underbrace{\;a\ldots a\;}_{n}$\bigskip
@@ -287,32 +237,77 @@
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\begin{frame}[c]
-\frametitle{\begin{tabular}{c}\\[3cm]\alert{Questions?}\end{tabular}}
+\begin{frame}[c,fragile]
+\frametitle{\alert{Questions?}}
 
-\mbox{}\footnotesize
-Thanks: ``\it{}By the way -  Scala is really getting quite fun
-when you start to get the hang of it\ldots''
+{\tiny
+\begin{verbatim}
+                               *
+                              * *
+                             *   *
+                            * * * *
+                           *       *
+                          * *     * *
+                         *   *   *   *
+                        * * * * * * * *
+                       *               *
+                      * *             * *
+                     *   *           *   *
+                    * * * *         * * * *
+                   *       *       *       *
+                  * *     * *     * *     * *
+                 *   *   *   *   *   *   *   *
+                * * * * * * * * * * * * * * * *
+               *                               *
+              * *                             * *
+             *   *                           *   *
+            * * * *                         * * * *
+           *       *                       *       *
+          * *     * *                     * *     * *
+         *   *   *   *                   *   *   *   *
+        * * * * * * * *                 * * * * * * * *
+       *               *               *               *
+      * *             * *             * *             * *
+     *   *           *   *           *   *           *   *
+    * * * *         * * * *         * * * *         * * * *
+   *       *       *       *       *       *       *       *
+  * *     * *     * *     * *     * *     * *     * *     * *
+ *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *
+* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+\end{verbatim}}
 
+
+\begin{textblock}{6}(8.5,3.5)
+\begin{bubble}[5cm]
+\footnotesize
+\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]
+++++++++[>+>++++<<-]>++>>
++<[-[>>+<<-]+>>]>+[-<<<[-
+>[+[-]+>++>>>-<<]<[<]>>++
+++++[<<+++++>>-]+<<++.[-]
+<<]>.>+[>>]>+]
+\end{lstlisting}
+\end{bubble}
+\end{textblock}
+  
 \end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
 
 \begin{frame}[c]
-\frametitle{Marks for CW6 (Part 1)}
+\frametitle{Marks for CW6 (Part 1 + 2)}
 
-Absolute raw marks, alleged collusions still included:
+Raw marks:
 
 \begin{itemize}
-\item 0\%: 18 students
-\item 1\%: 2
-\item 2\%: 11
-\item 3\%: 29
+\item 0\%: 21 students
+\item 1\%: 1
+\item 2\%: 2
+\item 3\%: 13
 \item 4\%: 18
-\item 5\%: 33
-\item 6\%: 55
-\item 7\%: 62 
+\item 5\%: 66
+\item 6\%: 154
 \end{itemize}  
 \end{frame}