Question

I want to typeset an algorithm in LaTeX. I m using the algorithmic package and environment to do so. Everything is working great except when I add comments (using COMMENT), they are output immediately after the statements. I would like for all the comments to be aligned (and offset from the statements). Is there an easy way to do so?

"Reproducing" the PDF output in HTML s pre, I want:

if condition then
   something         # comment 1
else
   something else    # comment 2

rather than

if condition then
   something  # comment 1
else
   something else  # comment 2

Answer 1

I would do it like this:

usepackage{eqparbox}

enewcommand{algorithmiccomment}[1]{hfilleqparbox{COMMENT}{# #1}}

Note 1: two document compilations are necessary to determine the maximum width of the comment.

Note 2: obviously, this only works for single line comments that aren t too long.

Following on from this idea, here s a complete example in the same sort of way, but also providing a command to have comments that break over lines:

documentclass{amsbook}
usepackage{algorithmic,eqparbox,array}

enewcommandalgorithmiccomment[1]{%
  hfill# eqparbox{COMMENT}{#1}%
}

ewcommandLONGCOMMENT[1]{%
  hfill# egin{minipage}[t]{eqboxwidth{COMMENT}}#1strutend{minipage}%
}
egin{document}
egin{algorithmic} 
STATE do nothing COMMENT{huh?} 
end{algorithmic}
egin{algorithmic} 
STATE do something LONGCOMMENT{this is a comment broken over lines} 
end{algorithmic}
egin{algorithmic} 
STATE do something else COMMENT{this is another comment} 
end{algorithmic}
end{document}

Answer 2

if condition then
   something        hspace{2in} # comment 1
else
   something else   hfill # comment 2

I m not sure if the hspace and hfill will work inside an environment. I assume that they will. hfill will set the comments flush right, while hspace{space} will give you that much space between your text. good luck.

Answer 3

If you want own indentions for different algorithms, you could do this by including the counter in the redefinition of the comment commands. Here is an example:

documentclass{amsbook}
usepackage{algorithmicx,algorithm,eqparbox,array}

algrenewcommand{algorithmiccomment}[1]{hfill// eqparbox{COMMENT	healgorithm}{#1}}
algnewcommand{LongComment}[1]{hfill// egin{minipage}[t]{eqboxwidth{COMMENT	healgorithm}}#1strutend{minipage}}

egin{document}
egin{algorithm}
egin{algorithmic}
State{do nothing}Comment{huh?}
end{algorithmic}
caption{Test Alg}
end{algorithm}

egin{algorithm}
egin{algorithmic}
State{do something} LongComment{this is a comment broken over lines}
State{do something else} Comment{this is another comment}
end{algorithmic}
caption{Other Alg}
end{algorithm}
end{document}

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