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[programming/exercises] some fixes

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Jan Grewe 2019-11-05 08:46:33 +01:00
parent dc8f270ebf
commit 0be4a67f21
1 changed files with 8 additions and 10 deletions
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programming/exercises/control_flow.tex
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@ -14,7 +14,7 @@
%%%%% text size %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%% text size %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage[left=20mm,right=20mm,top=25mm,bottom=25mm]{geometry} \usepackage[left=20mm,right=20mm,top=25mm,bottom=25mm]{geometry}
\pagestyle{headandfoot} \pagestyle{headandfoot}
\header{{\bfseries\large Exercise 5}}{{\bfseries\large Control Flow}}{{\bfseries\large 30. October, 2018}} \header{{\bfseries\large Exercise 5}}{{\bfseries\large Control Flow}}{{\bfseries\large 05. November, 2019}}
\firstpagefooter{Dr. Jan Grewe}{Phone: 29 74588}{Email: \firstpagefooter{Dr. Jan Grewe}{Phone: 29 74588}{Email:
jan.grewe@uni-tuebingen.de} jan.grewe@uni-tuebingen.de}
\runningfooter{}{\thepage}{} \runningfooter{}{\thepage}{}
@ -47,11 +47,9 @@ following pattern: ``variables\_datatypes\_\{lastname\}.m''
\begin{questions} \begin{questions}
\question Implement \code{for} loops in which the \emph{running variable}: \question Implement \code{for} loops in which the \emph{running variable}:
\begin{parts} \begin{parts}
\part ... assumes values from 0 to 10. Print the value of the running variable for each iteration step. \part ... assumes values from 0 to 10. Print (\code{disp}) the value of the running variable for each iteration step.
\begin{solution} \begin{solution}
for i = 1:10 for i = 1:10 disp(i); end;
disp(i);
end;
\end{solution} \end{solution}
\part ... assumes values from 10 to 0. Print out the value for each iteration. \part ... assumes values from 10 to 0. Print out the value for each iteration.
\part ... assumes values from 0 to 1 in steps of 0.1. Print out the value for each iteration. \part ... assumes values from 0 to 1 in steps of 0.1. Print out the value for each iteration.
@ -59,12 +57,12 @@ following pattern: ``variables\_datatypes\_\{lastname\}.m''
\question Indexing in vectors: \question Indexing in vectors:
\begin{parts} \begin{parts}
\part Define a vector \code{x} that contains values ranging from 101 to 200. \part Define a vector \code{x} that contains values ranging from 101 to 200 in steps of 1.
\part Use a \code{for} loop to print each element of \code{x}. Use the running variable for the indexing. \part Use a \code{for} loop to print each element of \code{x}. Use the running variable for the indexing.
\begin{solution} \begin{solution}
\code{for i = 1:length(x); disp(x(i)); end} \code{for i = 1:length(x); disp(x(i)); end}
\end{solution} \end{solution}
\part Do the same without use the running variable directly (not for indexing). \part Do the same without using the running variable directly (not for indexing).
\begin{solution} \begin{solution}
\code{for i : x; disp(i); end;} \code{for i : x; disp(i); end;}
\end{solution} \end{solution}
@ -74,7 +72,7 @@ following pattern: ``variables\_datatypes\_\{lastname\}.m''
\begin{parts} \begin{parts}
\part Use a loop to calculate the arithmetic mean. The mean is defined as: \part Use a loop to calculate the arithmetic mean. The mean is defined as:
$\overline{x}=\frac{1}{n}\sum\limits_{i=0}^{n}x_i $. $\overline{x}=\frac{1}{n}\sum\limits_{i=0}^{n}x_i $.
\part Use a loop to estimate the stadard deviation: \part Use a loop to estimate the standard deviation:
$\sigma=\sqrt{\frac{1}{n}\sum\limits_{i=0}^{n}(x_i-\overline{x})^2}$). $\sigma=\sqrt{\frac{1}{n}\sum\limits_{i=0}^{n}(x_i-\overline{x})^2}$).
\part Search the MATLAB help for functions that do the calculations for you :-). \part Search the MATLAB help for functions that do the calculations for you :-).
\end{parts} \end{parts}
@ -85,13 +83,13 @@ following pattern: ``variables\_datatypes\_\{lastname\}.m''
\part ... iterates endlessly. You can interrupt the execution with the command \code{Strg + C}. \part ... iterates endlessly. You can interrupt the execution with the command \code{Strg + C}.
\end{parts} \end{parts}
\question Use an endless \code{while} loop to individually print out the elements of a vector that contains 10 elements. Stop the execution after all elements have been printed. \question Use an endless \code{while} loop to individually display the elements of a vector that contains 10 elements. Stop the execution after all elements have been displayed on the command line.
\question Use the endless \verb+while+ loop to draw random numbers \question Use the endless \verb+while+ loop to draw random numbers
(\verb+randn+) until you hit one that is larger than 1.33. (\verb+randn+) until you hit one that is larger than 1.33.
\begin{parts} \begin{parts}
\part Count the number of required iterations. \part Count the number of required iterations.
\part Use a \code{for} loop to run the previous test 1000 times. Remember all counts and calculate the mean of it. \part Use a \code{for} loop to run the previous test 1000 times. Store all counts and calculate the mean of it.
\part Create a plot that shows for each of the 1000 trials, how often you had to draw. \part Create a plot that shows for each of the 1000 trials, how often you had to draw.
\part Play around with the threshold. What happens? \part Play around with the threshold. What happens?
\end{parts} \end{parts}