--- a/handouts/ho02.tex	Mon Feb 13 23:22:45 2017 +0000
+++ b/handouts/ho02.tex	Wed Mar 15 01:24:39 2017 +0000
@@ -3,7 +3,8 @@
 \usepackage{../langs}
 \usepackage{../graphics}
 \usepackage{../data}
-
+\usepackage{lstlinebgrd}
+\definecolor{capri}{rgb}{0.0, 0.75, 1.0}
 
 \begin{document}
 \fnote{\copyright{} Christian Urban, King's College London, 2014, 2015, 2016, 2017}
@@ -54,8 +55,8 @@
     x label style={at={(1.1,0.05)}},
     ylabel={\small time in secs},
     enlargelimits=false,
-    xtick={0,3000,...,9000},
-    xmax=10000,
+    xtick={0,2500,...,11000},
+    xmax=12000,
     ymax=35,
     ytick={0,5,...,30},
     scaled ticks=false,
@@ -86,9 +87,10 @@
     axis lines=left,
     width=5cm,
     height=5cm, 
-    legend entries={Java},  
+    legend entries={Java, Python},  
     legend pos=north west,
     legend cell align=left]
+\addplot[blue,mark=*, mark options={fill=white}] table {re-python2.data};
 \addplot[cyan,mark=*, mark options={fill=white}] table {re-java.data};
 \end{axis}
 \end{tikzpicture}
@@ -461,7 +463,9 @@
 for \pcode{matches} are shown in Figure~\ref{scala1}.
 
 \begin{figure}[p]
-\lstinputlisting{../progs/app5.scala}
+  \lstinputlisting[numbers=left,linebackgroundcolor=
+                  {\ifodd\value{lstnumber}\color{capri!3}\fi}]
+                  {../progs/app5.scala}
 \caption{Scala implementation of the \textit{nullable} and 
   derivative functions. These functions are easy to
   implement in functional languages, because their built-in pattern 
@@ -581,8 +585,8 @@
     x label style={at={(1.01,0.0)}},
     ylabel={time in secs},
     enlargelimits=false,
-    xtick={0,100,...,1000},
-    xmax=1100,
+    xtick={0,200,...,1100},
+    xmax=1200,
     ytick={0,5,...,30},
     scaled ticks=false,
     axis lines=left,
@@ -600,8 +604,8 @@
 \end{center}
 
 \noindent Now we are talking business! The modified matcher 
-can within 30 seconds handle regular expressions up to
-$n = 950$ before a StackOverflow is raised. Recall that Python and Ruby 
+can within 25 seconds handle regular expressions up to
+$n = 1,100$ before a StackOverflow is raised. Recall that Python and Ruby 
 (and our first version, Scala V1) could only handle $n = 27$ or so in 30 
 seconds. There is no change for our second example 
 $(a^*)^* \cdot b$---so this is still good.
@@ -652,7 +656,9 @@
 function introduced. Does this improve the speed? You bet!!
 
 \begin{figure}[p]
-\lstinputlisting{../progs/app6.scala}
+\lstinputlisting[numbers=left,linebackgroundcolor=
+  {\ifodd\value{lstnumber}\color{capri!3}\fi}]
+                {../progs/app6.scala}
 \caption{The simplification function and modified 
 \texttt{ders}-function; this function now
 calls \texttt{der} first, but then simplifies