On Tue, 20 Feb 2007, Vyatcheslav Yatskovsky wrote:
> Hi,
> I'm ConTeXting a text that follows:
>
> %%%%%%%%%%%%%%%%%
> \setupwhitespace[big]
> \setupinterlinespace[line=2.5ex]
> \starttext
>
> The Leslie Matrix is a matrix $L[1:X, 1:X]$ of the form
>
> $$\left( {\matrix{
> {a_1 } & {a_2 } & {a_3 } & \ldots & {a_X } \cr
> {b_1 } & 0 & 0 & 0 & 0 \cr
> 0 & {b_2 } & 0 & 0 & 0 \cr
> 0 & 0 & \ddots & 0 & 0 \cr
> 0 & 0 & 0 & {b_{X - 1} } & 0 \cr
> } } \right), $$
>
> to build which we need to know $a_x$, {\em ability to reproduce}, an average
> number of offsprings within a time step from an individual of age class $x$,
> and $b_x$, {\em probability of surviving}, a fraction of individuals that
> survives from age class $x$ to age class $x+1$.
>
> \stoptext
> %%%%%%%%%%%%
>
> and a matrix has big spacing BEFORE and normal spacing AFTER.
Change $$ ... $$ to \startformula \stopformula
> Interesting, but without two first setup lines, matrix glues to the
> subsequent text.
The use of $$ ... $$ for display math will not give you correct
spacing. Always use \startformula ... \stopformula
BTW, there is also \startmathmatrix in ConTeXt which allows you to
\definemathmatrix[pmatrix]
[left={\left(\,},
right={\,\right)}]
\startformula \startpmatrix
\NC {a_1 } \NC {a_2 } \NC {a_3 } \NC \ldots \NC {a_X } \NR
\NC {b_1 } \NC 0 \NC 0 \NC 0 \NC 0 \NR
\NC 0 \NC {b_2 } \NC 0 \NC 0 \NC 0 \NR
\NC 0 \NC 0 \NC \ddots \NC 0 \NC 0 \NR
\NC 0 \NC 0 \NC 0 \NC {b_{X - 1} } \NC 0 \NR
\stoppmatrix \stopformula
and some other fun stuff also. See My Way on math-align
http://dl.contextgarden.net/myway/mathalign.pdf
Aditya
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