Re: Curious blank page

[Aditya Mahajan <adityam@umich.edu>]

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On Sun, 19 Mar 2006, David Arnold wrote:

> Why is it that the rest of the page after Answers on page 4 of the
> compiled pdf is blank?

I have a similar problem. Attached is the (not so) minimal example 
that I could prepare. (This is part of my way on mathalignment). See 
the page break on page 2, while all the page is empty. Adding
\kern\zeropoint prevents the page break. But I find such an page break 
very confusing.


This is context version.
  TeXExec 5.4.3 - ConTeXt / PRAGMA ADE 1997-2005

                texexec : TeXExec 5.4.3 - ConTeXt / PRAGMA ADE 
1997-2005
                texutil : TeXUtil 9.0.0 - ConTeXt / PRAGMA ADE 
1992-2004
                    tex : pdfeTeXk, 3.141592-1.30.3-2.2 (Web2c 7.5.5)
                context : ver: 2006.04.07 11:24
                cont-en : ver: 2006.04.07 11:24  fmt: 2006.4.7  mes: 
english
                cont-nl : ver: 2006.04.07 11:24  fmt: 2006.4.7  mes: 
dutch

         total run time : 5 seconds


By the way, texmfstart newtexexec --version just gives
TeXExec | version 6.1.2 - 1997-2006 - PRAGMA ADE/POD

No version information of context is given!! What is the correct way 
to get complete version information from newtexexec.

Thanks,
Aditya

-- 
Aditya Mahajan, EECS Systems, University of Michigan
http://www.eecs.umich.edu/~adityam || Ph: 7342624008

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\usemodule[mag-01]

\setuptyping[style=\ttx\setupinterlinespace]
\setupheadertexts[section]

\setupbodyfontenvironment	[default][em=italic]
\def\AmSTeX{AmS\TeX} 

\gdef\ShowExample{
  \blank[small]
  \setupbackground
  \startbackground \typebuffer \stopbackground
  \getbuffer\blank[small]}


\starttext \setups[titlepage] \setups[title]
\definemathalignment
  [gather]
  [n=1,align=middle]
\startbuffer
\definemathmatrix
  [aligned]
  [n=2,distance=0pt,align={right,left}]

\definemathmatrix
  [gathered]
  [n=1,align=middle]

\startformula
  a = \frac{\left(\startaligned
    \NC xy \NC {}+ xy + xy \NR
    \NC    \NC {}+ xy + xy \NR
  \stopaligned \right)}{z}
  = \frac{\left(\startgathered
    \NC xy  + xy + xy \NR
    \NC   {}+ xy + xy \NR
  \stopgathered \right)}{z}
\stopformula
\stopbuffer
\ShowExample

\subsection[sec:split]{split (again)}
\type{mathmatrix} can also be used to define a split environment, with 
equations number at the center of the display.

\startbuffer
\definemathmatrix
  [dosplit]
  [n=2,distance=0pt,align={right,left}]

%D Need to change domatrixNC to have a {} so that bin operators
%D are treated properly

\def\startsplit#1\stopsplit{
  \def\dodomatrixNC
    {\gdef\domatrixNC{\endmath&{}}}
  \startdosplit#1\stopdosplit}
  
\placeformula \startformula \startsplit
  \NC f(x) \NC = (x+2)^2 + 2(x+2) + 3 \NR
  \NC \NC = x^2 + 4x + 4 + 2x + 4 + 3 \NR
  \NC \NC = x^2 + 6x + 11 \NR
\stopsplit \stopformula
\stopbuffer
\ShowExample

\section{Some Problems}

\subsection{What happened to my square brackets?}
% \kern\zeropoint
\startbuffer
\startformula \startgather
  [p] = 100 \NR
  [v] = 200 \NR
\stopgather \stopformula
\stopbuffer
\ShowExample

This is not what you would expect. An easy way to avoid such unexpected 
behavior is to start each line with \tex{NC}.
\startbuffer
\startformula \startgather
  \NC [p] = 100 \NR
  \NC [v] = 200 \NR
\stopgather \stopformula
\stopbuffer
\ShowExample

\section{Compatibility with \type{amsmath}}
\tex{startalign} provides a compatibility mode with \type{amsmath} syntax, 
which makes it easier to reuse work written in \LATEX.
\startbuffer
\placeformula \startformula \startalign
  f(x) &= x^3 + 2x^2 + 3 \\
  f'(x) &= 3x^2 + 4x \\
\stopalign \stopformula
\stopbuffer
\ShowExample

However, Hans does not like the syntax, especially the {\em loose label} for 
referring equations. This compatibility feature may disappear in the future. So, 
I suggest not to use it. There are subtle differences from the \type{amsmath} 
syntax, and it is much easier (and logical) to follow the \CONTEXT\ syntax.

\section{Missing Features}
As compared to \AmSTeX\ and \type{amsmath} package of \LATEX, the only display 
math environment missing from \CONTEXT\ is \type{multline}. I do not 
completely understand what is the expected behavior of \type{multline} 
environment. If someone understands what it is supposed to do, and needs that 
feature, make a feature request :)

Subformula numbering is a kludge. The subformula number needs to be specified 
manually.  Using mixed formula and subformula number needs some user 
intervention.  However, it is possible to make these transparent by defining 
your own macros.


\stoptext
\setups[lastpage] 

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