NetNews Usenet Archive 1992 #19/NN_1992_19.iso/spool/comp/text/tex/10828

Text File | 1992-09-02 | 1.8 KB | 44 lines

Path: sparky!uunet!mcsun!uknet!cam-cl!cam-cl!cet1
From: [e-mail] (C.E. Thompson)
Newsgroups: comp.text.tex
Subject: Re: How to test the page value of a float?
Message-ID: <[e-mail]>
Date: 2 Sep 92 13:57:00 GMT
References: <[e-mail]> <[e-mail]> <[e-mail]>
Sender: [e-mail] (Piete Brooks)
Reply-To: [e-mail] (C.E. Thompson)
Organization: U of Cambridge Computer Lab, UK
Lines: 31

In article <[e-mail]>, [e-mail]
(Donald Arseneau) writes:
|> In article <[e-mail]>, I wrote:
|> >Use \pageref and it should work on the second pass through LaTeX.
|>
|> But \pageref does not produce a pure number as it has definitions
|> of \@tempa and such in it.  So it is better to steal parts of the
|> \pageref definition.
|>
|> I came up with
|>
|> %  Assign unique label for float:
|> \edef\@tempa{\noexpand\label{F*\the\c@figure;T*\the\c@table}}\@tempa
|> %  get page number of this float:  {}{number} or \relax
|> \edef\@tempa{\csname r@F*\the\c@figure;T*\the\c@table\endcsname}%
|> \edef\thispage{\expandafter\@cdr\@tempa\@nil\space}%
|> \ifx\thispage\space\def\thispage{0 }\fi %  use 0 if unknown
|>
|> Then the test \ifnum\thispage=xxx will work, but always giving
|> \thispage=0 on the first pass through the document.

Even this assumes that \thepage has not been changed from its default
of \arabic{page}. If you redefine it as, say, \roman{page} then the
\pageref values will change correspondingly, and you will end up trying
to do things like "\ifnum iv=4". To get round this you would have to
dissect \label as well as \pageref.

Chris Thompson
Cambridge University Computing Service
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