Re: [Groff] Math symbol upside down?

[Clarke Echols]

Oops --

The problem appears to be in Ghostgum/ghostscript and how it
displays.  If I increase the point size substantially, I get
the double tilde that I want, but when I set it at 12 points,
it *appears* to be a straight line with a tilde underneath,
except for a slight crook at the end of the straight line.
Evidently it's a screen resolution problem (though I use a large,
high-resolution display).

Sorry about the false alarm...  I keep forgetting that interpolation
of pixel locations can lead to such anomalies.

Thanks for the response.  I was not aware of the \(~~ escape
sequence.

Clarke

(Ted Harding) wrote:
> On 06-May-06 Clarke Echols wrote:
> > I am playing around with a little project and decided to make a
> > drawing using groff accompanied by mathematical analysis text.
> >
> > I decided to use the \(~= sequence for the "approximately equal"
> > symbol in the math table, using the eroff manual I have from the
> > late 1980s as a reference.  In that manual, the symbol is a
> > horizontal bar with a tilde bar above it, but in the groff package
> > I got with cygwin, the tilde is on the bottom.  My PostScript
> > tutorial by Ross Smith indicates that the math font character is
> > actually a pair of tildes.
> >
> > What's going on?  I've never seen a tilde on the bottom before.
> > Is this a take-off spoof like GNU's not Unix? :-)
> >
> > Clarke
>
> Hmm, I'm not sure where you are getting this result from.
>
> Check out .../devps/S and you should find that both \(~=
> and \(~~ map to PostScript "approxequal" which is your
> "pair of tildes".
>
> Best wishes,
> Ted.
>
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> E-Mail: (Ted Harding) <address@hidden>
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> Date: 06-May-06                                       Time: 07:46:37
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