Algorithm2e writing simple pseudocode with multiple functions

Question

I am new at algorithm2e and I'm really struggling with the most simple things.

I would like to write an algorithm (pseudocode) with a few functions that call each other. For now, I have this minimal (not)working example:

\begin{algorithm}
    \caption{Some algorithm}
    \label{alg:some-algorithm}
    \DontPrintSemicolon

    \SetKwFunction{FMain}{Main}
    \SetKwFunction{FTest}{Test}

    \FMain{$f$, $a$, $b$, $\varepsilon$}{
        a\;
        b\;
        \KwRet\;
    }

    \FTest{$f$, $a$, $b$}{
        a\;
        b\;
        \KwRet\;
    }
\end{algorithm}

The output is the following:

As you can see, the first line of code a is on the same line as the function definition. Also, nothing is indented and the whole thing looks rather ugly.

What am I doing wrong?

Have you tried adding an empty line between the \FMain{$f$, $a$, $b$, $\varepsilon$}{ and the a\; ? — Nicolas
– Nicolas, Commented Nov 25, 2015 at 22:20
Are you interested in something like this? That is, where you have an "algorithm" that is defined as a set of functions and/or procedures? — Werner
– Werner ♦, Commented Nov 26, 2015 at 0:17
@Werner: yes, Your example looks OK. I would like to have one Main procedure/function along with two other procedures/functions. — alesc
– alesc, Commented Nov 26, 2015 at 9:03

jarauh · Accepted Answer · 2015-11-26 15:54:42Z

As the documentation (try texdoc algorithm2e on the command line or search for algorithm2e.pdf) says:

\SetKwFunction{KwFn}{Fn} defines a macro \KwFn{arg} which prints Fn in Function typography and its argument arg in argument typography, surrounded by a pair of parentheses.

In particular, \FMain and FTest both have only a single argument. They are used to correctly typeset a function name, not to define a new function. To typeset a function definition, use \SetKwProg{Prog}{Title}{is}{end}.

EDIT: The following example is in the documentation:

\SetAlgoLined
\SetKwProg{Fn}{Function}{ is}{end}
\Fn{afunc(i: int) : int}{return 0\;}

\SetKwProg{Def}{def}{:}{}
\Def{afunc(i: int)}{return 0\;}

leads to:

1 Function afunc(i: int) : int is
2 | return 0;
3 end
4 def afunc(i: int):
5 | return 0;

So the idea is that \SetKwProg defines a template for functions (e.g. \Fn or \Def). \Fn and \Def themselves now have two arguments, one for the header and one for the body of the function.

To adapt your example:

\begin{algorithm}
  \DontPrintSemicolon
  \SetKwFunction{FMain}{Main}
  \SetKwProg{Fn}{Function}{:}{}
  \Fn{\FMain{$f$, $a$, $b$, $\varepsilon$}}{
        a\;
        b\;
        \KwRet\;
  }
  \;
  \SetKwProg{Pn}{Function}{:}{\KwRet}
  \Pn{\FMain{$f$, $a$, $b$, $\varepsilon$}}{
        a\;
        b\;
  }
\end{algorithm}

gives

Thanks for the answer, it was really helpful. I didn't know that I also need to use the \SetKwProg in order to define the function. — alesc
– alesc, Commented Nov 28, 2015 at 8:51

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