Ugly matrix spacing

Ugly matrix spacing

[Vyatcheslav Yatskovsky]

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. 

Interesting, but without two first setup lines, matrix glues to the subsequent text. 

Best,
Vaytcheslav

Re: Ugly matrix spacing

[David Arnold]

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Try:

\placeformula[-]
\startformula
\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),
\stopformula

On Feb 19, 2007, at 2:24 PM, Vyatcheslav Yatskovsky wrote:

> $$\left( {\matrix{
>    {a_1 } & {a_2 } & {a_3 } &  \ldots  & {a_X }  \cr
>    {b_1 } & 0 & 0 & 0 & 0  \cr
>    0 & {b_2 } & 0 & 0 & 0  \cr
>    0 & 0 &  \ddots  & 0 & 0  \cr
>    0 & 0 & 0 & {b_{X - 1} } & 0  \cr
>  } } \right), $$


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Re: Ugly matrix spacing

[Aditya Mahajan]

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