--- a/LINKS	Fri Jun 22 13:34:05 2018 +0100
+++ b/LINKS	Tue Jun 26 01:49:32 2018 +0100
@@ -116,4 +116,18 @@
 ---------------------
 Scala resources
 
-https://danielwestheide.com/scala/neophytes.html
\ No newline at end of file
+https://danielwestheide.com/scala/neophytes.html
+
+
+
+
+
+
+
+functional programming
+----------------------
+Functional Data Structures
+https://cs.uwaterloo.ca/~plragde/flaneries/FDS/index.html
+
+Okasaki
+http://www.cs.cmu.edu/~rwh/theses/okasaki.pdf
\ No newline at end of file

Binary file handouts/pep-ho.pdf has changed

--- a/handouts/pep-ho.tex	Fri Jun 22 13:34:05 2018 +0100
+++ b/handouts/pep-ho.tex	Tue Jun 26 01:49:32 2018 +0100
@@ -214,21 +214,23 @@
 
 \begin{figure}[p]
 \begin{boxedminipage}{\textwidth}
+
+A Scala programm for generating pretty pictures of the Mandelbrot Set 
+(\url{https://en.wikipedia.org/wiki/Mandelbrot_set}):
 \begin{center}    
 \begin{tabular}{c}  
-\includegraphics[scale=0.15]{../pics/mand1.png}\\
+\includegraphics[scale=0.12]{../pics/mand1.png}
 \end{tabular}
-
-Wellknown Mandelbrot program for generating pretty pictures due to
-Benoit Mandelbrot. (\url{https://en.wikipedia.org/wiki/Mandelbrot_set})
-\bigskip
+\end{center}
 
+\begin{center}
+\begin{tabular}{@{}p{0.45\textwidth}|p{0.45\textwidth}@{}}
+  \bf sequential version: & \bf parallel version: (on 4 cores)\smallskip\\
 
-\begin{tabular}{@{}p{6cm}|p{6cm}@{}}
-  \includegraphics[scale=0.15]{../pics/mand4.png} &
-  \includegraphics[scale=0.15]{../pics/mand3.png} \\
-\footnotesize
-{\begin{lstlisting}
+  {\hfill\includegraphics[scale=0.12]{../pics/mand4.png}\hfill} &
+  {\hfill\includegraphics[scale=0.12]{../pics/mand3.png}\hfill} \\
+
+{\footnotesize\begin{lstlisting}[xleftmargin=-1mm]
 for (y <- (0 until H)) {
   for (x <- (0 until W)) {
     
@@ -243,11 +245,32 @@
   }
   viewer.updateUI()
 }   
-\end{lstlisting}}
-& \\
+\end{lstlisting}}   
+& 
+{\footnotesize\begin{lstlisting}[xleftmargin=0mm]
+for (y <- (0 until H).par) {
+  for (x <- (0 until W).par) {
+      
+    val c = start + 
+      (x * d_x + y * d_y * i)
+    val iters = iterations(c, max) 
+    val col = 
+      if (iters == max) black 
+      else colours(iters % 16)
+  
+    pixel(x, y, col)
+  }
+  viewer.updateUI()
+}   
+\end{lstlisting}}\\
+
+\centering\includegraphics[scale=0.5]{../pics/cpu2.png} &
+\centering\includegraphics[scale=0.5]{../pics/cpu1.png}\\ 
+
+
 \end{tabular}
 \end{center}
-\caption{Test \label{mand}}
+\caption{Test \label{mand}} 
 \end{boxedminipage}
 \end{figure}  
 

Binary file pics/cpu1.png has changed

Binary file pics/cpu2.png has changed

Binary file pics/mand3.png has changed

Binary file pics/mand4.png has changed

--- a/progs/mandelbrot.scala	Fri Jun 22 13:34:05 2018 +0100
+++ b/progs/mandelbrot.scala	Tue Jun 26 01:49:32 2018 +0100
@@ -1,3 +1,6 @@
+// Mandelbrot pictures
+//   see https://en.wikipedia.org/wiki/Mandelbrot_set
+
 import java.awt.Color
 import java.awt.Dimension
 import java.awt.Graphics
@@ -19,9 +22,10 @@
   def abs() = Math.sqrt(this.re * this.re + this.im * this.im)
 }
 
+// to allow the notation n + m * i
 object i extends Complex(0, 1)
+implicit def double2complex(re: Double) = Complex(re, 0)
 
-implicit def double2complex(re: Double): Complex = Complex(re, 0)
 
 // some customn colours for the "sliding effect"
 val colours = List(
@@ -84,6 +88,8 @@
 }
 
 // main function 
+//    start and end are the upper-left and lower right corners 
+//    max is the number of maximum iterations
 def mandelbrot(start: Complex, end: Complex, max: Int) : Unit = {
   viewer.clearCanvas(black)
   
@@ -91,8 +97,8 @@
   val d_x = (end.re - start.re) / W
   val d_y = (end.im - start.im) / H
    
-  for (y <- (0 until H).par) {
-    for (x <- (0 until W).par) {
+  for (y <- (0 until H)) {
+    for (x <- (0 until W)) {
     
      val c = start + 
       (x * d_x + y * d_y * i)
@@ -107,6 +113,7 @@
   }   
 }
 
+
 // Examples
 //==========