\subformulanumber no longer working

\subformulanumber no longer working

[Tobias Burnus]

Hi,

I have something like this:
--------------------------------
\placeformula
$$
\eqalignno{
  h\nu &=E=c\frac{h}{\lambda}&\formulenummer{a}\cr
  \Rightarrow \lambda &= c\frac{h}{\Delta E} = (247\pm3)~{\rm nm}
                         &\subformulenummer{b}\cr
  \Rightarrow     \nu &= \frac{\Delta E}{h} =
(1{,}21\pm0{,}02)10^{15}~{\rm Hz}
                         &\subformulenummer{c}\cr}
$$
\bye
---------------------------------

it was definitly working, but now it causes error messages.

If I remove the \placeformula (and replace the \[sub]formulanumber by ""
(so a, b and c remain)) everything works as expected.

Please send me a bug fix soon.

Tobias

PS: The error message is:
----------------------
! Missing $$ inserted.
<to be read again> 
                   \floatrighteqo 
<argument> \eqno 
                 {\doformulenummer [][][]{}}
\doifelse ...\ifx \!!stringa \!!stringb #3\else #4
                                                  \fi 
\dostopformula ->\doplaceformulanumber 
                                       \getvalue {\e!stop \getvalue
{\??fm \...
l.9 $$
----------------------
-- 
This above all: To thine own self be true / And it must follow as
the night the day / Thou canst not then be false to any man.

Re: \subformulanumber no longer working

[Hans Hagen]

At 07:08 PM 10/28/2001 +0100, Tobias Burnus wrote:

>If I remove the \placeformula (and replace the \[sub]formulanumber by ""
>(so a, b and c remain)) everything works as expected.
>
>Please send me a bug fix soon.

This took me a while to track down (thanks to fuzzy tex messages):

%D We need a hook into the plain math alignment macros
%D
%D \starttypen
%D \displaylines
%D \eqalignno
%D \eqalignno
%D \stoptypen
%D
%D Otherwise we get a missing \type {$$} error reported.

\def\resetdisplaymatheq
   {\let\normalleqno\relax \let\leqno\relax
    \let\normalreqno\relax \let\eqno \relax
    \let\doplaceformulanumber\relax}

\let\normaldispl@y\displ@y

\def\displ@y{\resetdisplaymatheq\normaldispl@y}

This can go into core-mat.tex (this extends a plain macro)

Hans
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