diff --git a/bootstrap/lecture/bootstrap.tex b/bootstrap/lecture/bootstrap.tex
index e9e22f8..eba1aac 100644
--- a/bootstrap/lecture/bootstrap.tex
+++ b/bootstrap/lecture/bootstrap.tex
@@ -191,3 +191,7 @@ Estimate the statistical significance of a correlation coefficient.
   coefficient computed from the original data.
 \end{enumerate}
 \end{exercise}
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\printsolutions
diff --git a/chapter.mk b/chapter.mk
index 494949f..015c9dc 100644
--- a/chapter.mk
+++ b/chapter.mk
@@ -46,7 +46,7 @@ watchchapter :
 cleanchapter : cleanpythonplots cleangnuplots
 	rm -f *~ 
 	rm -f $(BASENAME).aux $(BASENAME).log
-	rm -f $(BASENAME)-chapter.aux $(BASENAME)-chapter.log $(BASENAME)-chapter.out $(BASENAME)-chapter.idx
+	rm -f $(BASENAME)-chapter.aux $(BASENAME)-chapter.log $(BASENAME)-chapter.out $(BASENAME)-chapter.idx $(BASENAME)-chapter-solutions.tex
 
 
 cleanallchapter : cleanchapter
diff --git a/debugging/lecture/debugging.tex b/debugging/lecture/debugging.tex
index a61c9fb..e7d213e 100644
--- a/debugging/lecture/debugging.tex
+++ b/debugging/lecture/debugging.tex
@@ -505,3 +505,6 @@ The debugger offers some more (advanced) features but the
 functionality offered by the basic tools is often enough to debug a
 program.
 
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%\printsolutions
diff --git a/designpattern/lecture/designpattern.tex b/designpattern/lecture/designpattern.tex
index 9f97522..1fb191d 100644
--- a/designpattern/lecture/designpattern.tex
+++ b/designpattern/lecture/designpattern.tex
@@ -168,3 +168,7 @@ x = randi(6, 100, 1);      % Some integer-valued data.
 h = h/sum(h);              % Normalize to probability.
 bar(b, h);                 % Plot the probabilities.
 \end{lstlisting}
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%\printsolutions
diff --git a/header.tex b/header.tex
index ae222e3..b208c30 100644
--- a/header.tex
+++ b/header.tex
@@ -285,7 +285,6 @@
 \usepackage{mdframed}
 \usepackage{xstring}
 \newlistof{exercisef}{loe}{\tr{Exercises}{\"Ubungen}}
-\newcommand{\codepath}{}
 \DeclareFloatingEnvironment[
   fileext=loe,
   name={\tr{Exercise}{\"Ubung}},
@@ -293,38 +292,44 @@
   chapterlistsgaps=on,
 ]{exercisef}
 \newboolean{showexercisesolutions}
-\setboolean{showexercisesolutions}{false}
+\setboolean{showexercisesolutions}{true}
+\newwrite\solutions  % file descriptor for writing solutions
+% we need to know the name of the included file as \currentjobname:
+\usepackage{xpatch}
+\makeatletter
+\def\currentjobname{\jobname}% 
+\xpretocmd{\include}{\def\currentjobname{#1}\immediate\openout\solutions=\currentjobname-solutions}{}{}
+\makeatother
+\usepackage{needspace}
 \newenvironment{exercise}[2]%
-  { \newcommand{\exercisesource}{#1}%
-    \newcommand{\exercisefile}{\protect\StrSubstitute{#1}{_}{\_}}%
-    \newcommand{\exerciseoutput}{#2}%
-    \setlength{\fboxsep}{2mm}%
+  { \setlength{\fboxsep}{2mm}%
     \newcommand{\saveenumi}{\theenumi}\renewcommand{\labelenumi}{(\alph{enumi})}%
     \captionsetup{singlelinecheck=off,hypcap=false,labelfont={large,sf,it,bf},%
                   font={large,sf,it,bf},skip={0.5ex}}%
     \begin{mdframed}[linewidth=0pt,backgroundcolor=exerciseback]%
-      \captionof{exercisef}[\exercisefile]{}%
+      \captionof{exercisef}[\protect\StrSubstitute{#1}{_}{\_}]{}%
       \captionsetup{font={normal,sf,it}}%
+      \immediate\write\solutions{\unexpanded{%
+        \subsection}[Exercise \thechapter.\arabic{exercisef}]%
+          {\unexpanded{\needspace{4\baselineskip}}Exercise \thechapter.\arabic{exercisef}}}%
+      \immediate\write\solutions{\unexpanded{\label}{solution\arabic{exercisef}}}%
+      \immediate\write\solutions{\unexpanded{\lstinputlisting[belowskip=0ex,aboveskip=0ex,%
+        nolol=true, title={\textbf{Source code:} \protect\StrSubstitute{#1}{_}{\_}}]}{#1}}%
+      \ifthenelse{\equal{#2}{}}{}%
+        {\immediate\write\solutions{\unexpanded{\lstinputlisting[language={},%
+           nolol=true, title={\textbf{Output:}}, belowskip=0ex, aboveskip=1ex]}{#2}}}%
+      \immediate\write\solutions{}%
   }%
-  { \renewcommand{\theenumi}{\saveenumi}%
-    \ifthenelse{\boolean{showexercisesolutions}}%
-      { \hypersetup{hypertexnames=false}%
-        \ifthenelse{\equal{\exercisesource}{}}{}%
-        { \addtocounter{lstlisting}{-1}%
-          \lstinputlisting[belowskip=0pt,aboveskip=1ex,nolol=true,%
-                           title={\textbf{\tr{Solution}{L\"osung}:} \exercisefile}]%
-                          {\codepath\exercisesource}%
-          \ifthenelse{\equal{\exerciseoutput}{}}{}%
-            { \addtocounter{lstlisting}{-1}%
-              \lstinputlisting[language={},title={\textbf{\tr{Output}{Ausgabe}:}},%
-                               nolol=true,belowskip=0pt]%
-                              {\codepath\exerciseoutput}%
-            }%
-        }%
-        \hypersetup{hypertexnames=true}%
-      }{}%
+  { \ifthenelse{\boolean{showexercisesolutions}}%
+      {\hspace*{\fill}\hyperref[solution\arabic{exercisef}]{Solution}}{}%
+    \renewcommand{\theenumi}{\saveenumi}%
     \end{mdframed}%
   }
+}
+\newcommand{\printsolutions}{\immediate\closeout\solutions%
+  \ifthenelse{\boolean{showexercisesolutions}}{%
+    \clearpage\section{Solutions to the exercises}%
+    \input{\currentjobname-solutions}}{}}
 \setlength{\cftexercisefindent}{1.2em}
 \setlength{\cftexercisefnumwidth}{2.6em}
 
diff --git a/likelihood/lecture/likelihood.tex b/likelihood/lecture/likelihood.tex
index ec286af..a5c87a7 100644
--- a/likelihood/lecture/likelihood.tex
+++ b/likelihood/lecture/likelihood.tex
@@ -362,3 +362,7 @@ activity pattern in the population $r_1$, $r_2$, ... $r_n$ is thus
 \[ {\cal L}(\phi|r_1, r_2, \ldots r_n) = \sum_{i=1}^n \log p_i(r_i|\phi) \]
 The angle $\phi$ that maximizes this likelihood is then an estimate of
 the orientation of the edge.
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\printsolutions
diff --git a/plotting/lecture/plotting.tex b/plotting/lecture/plotting.tex
index 08c8fa0..a9d665b 100644
--- a/plotting/lecture/plotting.tex
+++ b/plotting/lecture/plotting.tex
@@ -778,3 +778,7 @@ Key ingredients for a good data plot:
   thicker lines help.
 \item Error bars wherever they are appropriate.
 \end{itemize}
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%\printsolutions
diff --git a/pointprocesses/lecture/pointprocesses.tex b/pointprocesses/lecture/pointprocesses.tex
index 824112e..a03f5a8 100644
--- a/pointprocesses/lecture/pointprocesses.tex
+++ b/pointprocesses/lecture/pointprocesses.tex
@@ -551,3 +551,7 @@ kernel.
   the same size as the original stimulus contained in file
   \file{sta\_data.mat}.
 \end{exercise}
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\printsolutions
diff --git a/pointprocesses/lecture/pointprocessscetchA.eps b/pointprocesses/lecture/pointprocessscetchA.eps
index 67a0c1b..2ff01b6 100644
--- a/pointprocesses/lecture/pointprocessscetchA.eps
+++ b/pointprocesses/lecture/pointprocessscetchA.eps
@@ -1,7 +1,7 @@
 %!PS-Adobe-2.0 EPSF-2.0
 %%Title: pointprocessscetchA.tex
-%%Creator: gnuplot 5.0 patchlevel 6
-%%CreationDate: Thu Oct 17 14:13:46 2019
+%%Creator: gnuplot 4.6 patchlevel 4
+%%CreationDate: Sat Nov 30 23:19:23 2019
 %%DocumentFonts: 
 %%BoundingBox: 50 50 373 135
 %%EndComments
@@ -18,7 +18,6 @@ gnudict begin
 /Dashlength 1 def
 /Landscape false def
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 /Rounded true def
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 /SuppressPDFMark false def
@@ -30,11 +29,11 @@ gnudict begin
 %
 /vshift -73 def
 /dl1 {
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+  10.0 Dashlength mul mul
   Rounded { currentlinewidth 0.75 mul sub dup 0 le { pop 0.01 } if } if
 } def
 /dl2 {
-  10.0 Dashlength userlinewidth gnulinewidth div mul mul mul
+  10.0 Dashlength mul mul
   Rounded { currentlinewidth 0.75 mul add } if
 } def
 /hpt_ 31.5 def
@@ -48,7 +47,7 @@ gnudict begin
   } if
 } def
 %
-% Gnuplot Prolog Version 5.1 (Oct 2015)
+% Gnuplot Prolog Version 4.6 (September 2012)
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 %/SuppressPDFMark true def
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@@ -65,11 +64,11 @@ gnudict begin
 /vpt2 vpt 2 mul def
 /hpt2 hpt 2 mul def
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-	Blacktext {gsave 0 setgray textshow grestore} {textshow} ifelse} def
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 /Rshow {currentpoint stroke M dup stringwidth pop neg vshift R
-	Blacktext {gsave 0 setgray textshow grestore} {textshow} ifelse} def
+	Blacktext {gsave 0 setgray show grestore} {show} ifelse} def
 /Cshow {currentpoint stroke M dup stringwidth pop -2 div vshift R 
-	Blacktext {gsave 0 setgray textshow grestore} {textshow} ifelse} def
+	Blacktext {gsave 0 setgray show grestore} {show} ifelse} def
 /UP {dup vpt_ mul /vpt exch def hpt_ mul /hpt exch def
   /hpt2 hpt 2 mul def /vpt2 vpt 2 mul def} def
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 /PL {stroke userlinewidth setlinewidth
 	Rounded {1 setlinejoin 1 setlinecap} if} def
 3.8 setmiterlimit
-% Classic Line colors (version 5.0)
+% Default Line colors
 /LCw {1 1 1} def
 /LCb {0 0 0} def
 /LCa {0 0 0} def
@@ -96,21 +95,19 @@ gnudict begin
 /LC6 {0 0 0} def
 /LC7 {1 0.3 0} def
 /LC8 {0.5 0.5 0.5} def
-% Default dash patterns (version 5.0)
-/LTB {BL [] LCb DL} def
+% Default Line Types
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-/LTb {PL [] LCb DL} def
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@@ -332,14 +329,9 @@ gnudict begin
 %
 /languagelevel where
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-dup 2 lt
-	{/InterpretLevel1 true def
-	 /InterpretLevel3 false def}
-	{/InterpretLevel1 Level1 def
-	 2 gt
-	    {/InterpretLevel3 Level3 def}
-	    {/InterpretLevel3 false def}
-	 ifelse }
+ 2 lt
+	{/InterpretLevel1 true def}
+	{/InterpretLevel1 Level1 def}
  ifelse
 %
 % PostScript level 2 pattern fill definitions
@@ -428,7 +420,6 @@ Level1 {Level1PatternFill} {Level2PatternFill} ifelse
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-%
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 {} {
 /SDict 10 dict def
@@ -438,42 +429,14 @@ systemdict /pdfmark known not {
 SDict begin [
   /Title (pointprocessscetchA.tex)
   /Subject (gnuplot plot)
-  /Creator (gnuplot 5.0 patchlevel 6)
-  /Author (grewe)
+  /Creator (gnuplot 4.6 patchlevel 4)
+  /Author (jan)
 %  /Producer (gnuplot)
 %  /Keywords ()
-  /CreationDate (Thu Oct 17 14:13:46 2019)
+  /CreationDate (Sat Nov 30 23:19:23 2019)
   /DOCINFO pdfmark
 end
 } ifelse
-%
-% Support for boxed text - Ethan A Merritt May 2005
-%
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 %%Page: 1 1
@@ -487,9 +450,10 @@ newpath
 2.000 UL
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 LCb setrgbcolor
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 LTb
 gsave 6208 824 N 0 -32 V 121 32 V -121 32 V 0 -32 V 1 PolyFill
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 stroke
 2.000 UL
 LTb
-0.00 0.00 0.00 C % Begin plot #1
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diff --git a/pointprocesses/lecture/pointprocessscetchA.pdf b/pointprocesses/lecture/pointprocessscetchA.pdf
index cb30829..031d805 100644
Binary files a/pointprocesses/lecture/pointprocessscetchA.pdf and b/pointprocesses/lecture/pointprocessscetchA.pdf differ
diff --git a/pointprocesses/lecture/pointprocessscetchB.eps b/pointprocesses/lecture/pointprocessscetchB.eps
index a04b551..58a25ce 100644
--- a/pointprocesses/lecture/pointprocessscetchB.eps
+++ b/pointprocesses/lecture/pointprocessscetchB.eps
@@ -1,7 +1,7 @@
 %!PS-Adobe-2.0 EPSF-2.0
 %%Title: pointprocessscetchB.tex
-%%Creator: gnuplot 5.0 patchlevel 6
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+%%Creator: gnuplot 4.6 patchlevel 4
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 %%DocumentFonts: 
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 %%EndComments
@@ -18,7 +18,6 @@ gnudict begin
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 /SuppressPDFMark false def
@@ -30,11 +29,11 @@ gnudict begin
 %
 /vshift -73 def
 /dl1 {
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 } def
 /dl2 {
-  10.0 Dashlength userlinewidth gnulinewidth div mul mul mul
+  10.0 Dashlength mul mul
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 } def
 /hpt_ 31.5 def
@@ -48,7 +47,7 @@ gnudict begin
   } if
 } def
 %
-% Gnuplot Prolog Version 5.1 (Oct 2015)
+% Gnuplot Prolog Version 4.6 (September 2012)
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 /hpt2 hpt 2 mul def
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 /Rshow {currentpoint stroke M dup stringwidth pop neg vshift R
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 /PL {stroke userlinewidth setlinewidth
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 3.8 setmiterlimit
-% Classic Line colors (version 5.0)
+% Default Line colors
 /LCw {1 1 1} def
 /LCb {0 0 0} def
 /LCa {0 0 0} def
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diff --git a/pointprocesses/lecture/pointprocessscetchB.pdf b/pointprocesses/lecture/pointprocessscetchB.pdf
index 3b50dec..2517ae1 100644
Binary files a/pointprocesses/lecture/pointprocessscetchB.pdf and b/pointprocesses/lecture/pointprocessscetchB.pdf differ
diff --git a/programming/lecture/programming.tex b/programming/lecture/programming.tex
index e94ff6c..417b92e 100644
--- a/programming/lecture/programming.tex
+++ b/programming/lecture/programming.tex
@@ -1,5 +1,6 @@
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\chapter{Programming in \matlab}\label{programming}
+\chapter{Programming in \matlab}
+\label{programming}
 
 In this chapter we will cover the basics of programming in
 \matlab{}. Starting with the concept of simple variables and data
@@ -1768,3 +1769,7 @@ legend('show')
   duplication or it grows too large, it is high time to consider
   extracting features into separate functions.
 \end{ibox}
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\printsolutions
diff --git a/programmingstyle/lecture/programmingstyle.tex b/programmingstyle/lecture/programmingstyle.tex
index 558d5d6..0542e65 100644
--- a/programmingstyle/lecture/programmingstyle.tex
+++ b/programmingstyle/lecture/programmingstyle.tex
@@ -4,7 +4,6 @@
   more months might as well have been written by someone
   else.}{Eagleson's law}
 
-%\selectlanguage{ngerman}
 Cultivating a good code style is not just a matter of good taste but
 rather is a key ingredient for readability and maintainability of code
 and, in the end, facilitates reproducibility of scientific
@@ -36,7 +35,7 @@ of the program but two questions remain: (i) How to organize the files
 on the file system and (ii) how to name them that the controlling
 script is easily identified among the other \codeterm{m-files}.
 
-Upon installation ``MATLAB'' creates a folder called \file{MATLAB} in
+Upon installation \matlab{} creates a folder called \file{MATLAB} in
 the user space (Windows: My files, Linux: Documents, MacOS:
 Documents). Since this folder is already appended to the Matlab search
 path (Box~\ref{matlabpathbox}), it is easiest to stick to it for the
@@ -427,4 +426,5 @@ readability and comprehensibility pays off, even to the author!
   Johnson}
 
 
-\selectlanguage{english}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%\printsolutions
diff --git a/regression/lecture/regression.tex b/regression/lecture/regression.tex
index c60b926..762e432 100644
--- a/regression/lecture/regression.tex
+++ b/regression/lecture/regression.tex
@@ -1,6 +1,5 @@
 \chapter{\tr{Optimization and gradient descent}{Optimierung und Gradientenabstieg}}
 
-% \selectlanguage{ngerman}
 To understand the behaviour of a given system sciences often probe the
 system with input signals and then try to explain the responses
 through a model. Typically the model has a few parameter that specify
@@ -356,7 +355,6 @@ large.
     iteration of the algorithm.} \label{gradientdescentfig}
 \end{figure}
 
-\setboolean{showexercisesolutions}{false}
 \begin{exercise}{gradientDescent.m}{}
   Implement the gradient descent for the problem of the linear
   equation for the measured data in file \file{lin\_regression.mat}.
@@ -407,4 +405,6 @@ designed for optimizations in the least square error sense
   parameter increases complexity and is computationally expensive.
 \end{important}
 
-\selectlanguage{english}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\printsolutions
diff --git a/regression/lecture/regression_de.tex b/regression/lecture/regression_de.tex
index f72a406..fe86f41 100644
--- a/regression/lecture/regression_de.tex
+++ b/regression/lecture/regression_de.tex
@@ -368,7 +368,6 @@ Punkte in Abbildung \ref{gradientdescentfig} gro{\ss}.
     Optimierungsschritt an.} \label{gradientdescentfig}
 \end{figure}
 
-\setboolean{showexercisesolutions}{false}
 \begin{exercise}{gradientDescent.m}{}
   Implementiere den Gradientenabstieg f\"ur das Problem der
   Parameteranpassung der linearen Geradengleichung an die Messdaten in
diff --git a/scientificcomputing-script.tex b/scientificcomputing-script.tex
index 03d8c8e..1e5fb9d 100644
--- a/scientificcomputing-script.tex
+++ b/scientificcomputing-script.tex
@@ -67,7 +67,6 @@
 \lstset{inputpath=regression/code}
 \include{regression/lecture/regression}
 
-\setboolean{showexercisesolutions}{false}
 \graphicspath{{likelihood/lecture/}{likelihood/lecture/figures/}}
 \lstset{inputpath=likelihood/code}
 \include{likelihood/lecture/likelihood}
diff --git a/statistics/lecture/cumulative.py b/statistics/lecture/cumulative.py
index 7c74035..a1cc849 100644
--- a/statistics/lecture/cumulative.py
+++ b/statistics/lecture/cumulative.py
@@ -15,7 +15,7 @@ gausscdf = np.cumsum(gauss)*dx
 
 # plot:
 plt.xkcd()
-fig = plt.figure( figsize=(6, 2.6) )
+fig = plt.figure( figsize=(6, 2.4) )
 ax = fig.add_subplot(1, 1, 1)
 ax.spines['right'].set_visible(False)
 ax.spines['top'].set_visible(False)
diff --git a/statistics/lecture/statistics.tex b/statistics/lecture/statistics.tex
index 583f757..319cec3 100644
--- a/statistics/lecture/statistics.tex
+++ b/statistics/lecture/statistics.tex
@@ -500,3 +500,7 @@ insufficiently or not at all detected by the correlation coefficient
     coefficients close to zero. $\xi$ denote normally distributed
     random numbers.}
 \end{figure}
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\printsolutions