[OS X TeX] Invisible character

[Jonathan Kew]

On 22 Jun 2006, at 1:52 am, Alain Schremmer wrote:
>
> Rather than elaborate, let me give an output of the modified  
> Robertson macro:
>
>    \begin{center}
>        \begin{tabular}{@{} ccc @{}}
>            \toprule
>        %Row0
>                   ð
>            &    ð
>            &    ð
>            \\
>            \midrule
>        %Row1
>                   ð
>            &    ð
>            &    ð
>            \\
>            \bottomrule
>        \end{tabular}
>    \end{center}
>
> The idea is that, with this, I can see where what goes where and  
> what I don't fill doesn't show in the pdf.
>
> Actually, it still had the bitten apples (option shift K) in the  
> macro but when I pasted above I got empty squares. I pasted the ð  
> by hand because this is often how it comes out by now in TeXShop— 
> but not always!—and, at least for now, does not show on the pdf.

So you want a "placeholder" in the source that the TeXShop macro  
inserts, and you want it to be visible in the source text, but to  
produce nothing in the output if you leave it as-is.

Using a character such as ð or  or any other is risky, as whether  
it'll be visible depends on the encoding and font you happen to be  
using.

How about simply using {} as the placeholder text? That's an empty  
group, and produces no output.

JK


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