How can I use switch cases in algorithmicx? For example a code like this:
switch s do
--case a
----assert(1)
--case b
----assert(0)
etc.
Is is possible to define it as a command?
[Tex/LaTex] Switch cases in algorithmic
algorithmicxalgorithms
Related Solutions
Here is a modification added to algorithmic that allows you to \BREAK and have an annotated loop \ALOOP (and \ENDALOOP). It is based on a copy of the regular \LOOP and \ENDLOOP combinations, with an added parameter for annotation. Of course, more modifications are possible:
\documentclass{article}
\usepackage{algorithm,algorithmic}% http://ctan.org/pkg/algorithms
% Algorithmic modifications
\makeatletter
\newcommand{\ALOOP}[1]{\ALC@it\algorithmicloop\ #1%
\begin{ALC@loop}}
\newcommand{\ENDALOOP}{\end{ALC@loop}\ALC@it\algorithmicendloop}
\renewcommand{\algorithmicrequire}{\textbf{Input:}}
\renewcommand{\algorithmicensure}{\textbf{Output:}}
\newcommand{\algorithmicbreak}{\textbf{break}}
\newcommand{\BREAK}{\STATE \algorithmicbreak}
\makeatother
\begin{document}
\begin{algorithm}
\caption{My-Algorithm}\label{algo:blah}
\begin{algorithmic}[1]
\show\LOOP
\REQUIRE X
\ENSURE Y
% STEP 1
\STATE \COMMENT{\textbf{Step 1}} some something
\ALOOP {outer} % Outer loop
% STEP 2
\STATE \COMMENT{\textbf{Step 2}} do something more
\IF {$a = b$}
\RETURN $c$
\ELSE
\ALOOP {inner} % Inner loop
% STEP 3
\STATE \COMMENT{\textbf{Step 3}} do some more
\IF {$b = c$}
\STATE $y = x$
\BREAK % intending to break
\ELSE
% STEP 4
\STATE \COMMENT{\textbf{Step 4}} and yet some more
\ENDIF
\ENDALOOP
\ENDIF
\ENDALOOP
\end{algorithmic}
\end{algorithm}
\end{document}
It would also be possible to modify \BREAK to take an argument if you want to annotate that as well (like breaking out of a specific loop, say).
For completeness, I've fixed your use of \bf. As such, see Does it matter if I use \textit or \it, \bfseries or \bf, etc. and Will two-letter font style commands (\bf, \it, …) ever be resurrected in LaTeX?
Yes, this can be done using the \algdef command. This is an example:
\documentclass{article}
\usepackage{algpseudocode}
\algdef{SE}{PreLoop}{EndPreLoop}[1]{\textbf{preloop} \(\mbox{#1}\) \textbf{do}}{\textbf{end}}%
\begin{document}
\begin{algorithmic}[1]
\Procedure{Euclid}{$a,b$}\Comment{The g.c.d. of a and b}
\State $r\gets a\bmod b$
\PreLoop{$r\not=0$}\Comment{We have the answer if r is 0}
\State $a\gets b$
\State $b\gets r$
\State $r\gets a\bmod b$
\EndPreLoop\label{euclidendwhile}
\State \textbf{return} $b$\Comment{The gcd is b}
\EndProcedure
\end{algorithmic}
\end{document}
For more information, see the algorithmicx manual, e.g., http://mirror.unl.edu/ctan/macros/latex/contrib/algorithmicx/algorithmicx.pdf .
Related Question
- [Tex/LaTex] Alternate row colors (shade rows) in algorithmic environment
- [Tex/LaTex] Algorithmicx multiple statements per line aligned over all lines
- [Tex/LaTex] Customizing some aspect of algorithmic environment
- [Tex/LaTex] stop bold in algorithmx
- [Tex/LaTex] Create a smart cross-reference to a line in an ‘algorithmic’ environment using \autoref
Best Answer
Use the following:
Both new "environments"
\Switch...\EndSwitchand\Case...\EndCaseare defined to have beginning and ending text. However, using\algnotext*{<env>}removes any typesetting of that command, effectively removing the ending command for both\Switchand\Case. It's still needed, since there may be more than one entry so its not possible to generalise with some number-of-lines-termination.