LaTeX.org

Excellent! Thanks.

This is almost certainly a limitation of the user, but I can't get the ifmtarg to do what I expect.

I have a macro that adds some text to its arg. I'd like for the macro to output nothing if the arg is empty.

Something like

\newcommand{\hexaddr}[1]{%
\texttt{\#0#1h}%
}


I'd like to avoid ...

Can someone suggest a way for me to create an integrated circuit element in a PGF drawing? I'm trying to draw some logic circuits, and I need to use more than just the basic logic gates.

For example, I'd like to use a 74151N Multiplexer.
74151N Block Diagram.png

It would be nice if I could ...

I did notice that when I inserted line breaks in the texts that Parallel got totally thrown off and did something resembling the screen shot you showed. My solution was to make paragraphs out of each line by (I was doing an epic poem) inserting a blank line in between each line.

Can you post a minimal example that demonstrates the problem?

I'd like to have two parallel texts (different languages), one of which is double spaced (to allow me to mark it up with a pen) and the other is single spaced. To make them occupy similar vertical space, I'd make the double-spaced text wider than the single-spaced text.

I can't seem to get the ...

Have you tried making the titles (or any other paragraphs you wish to align horizontally) their own set of parallel texts?

\begin{Parallel}{3in}{3in}
\ParallelLText{
párrafo uno
}
\ParallelRText{
paragraph one
}
\ParallelPar

\ParallelLText{
Título 2
...
}
\ParallelRText{
Title 2

...
}
...
\end ...