Re: ntg-context Digest, Vol 11, Issue 29

Re: ntg-context Digest, Vol 11, Issue 29

[Fei He]

Hi all,

I have a math equation question too. This has made me pulling my hair
off, for a while. Please see below:


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> \usemodule[amsl]
> \starttext
> 
> \startformula
>      {\bf f(x)} =
>      \cases{
>          \sum_{x=1}^n x      & if I am false
>          \\
          ~~~~~~ I can never make this work for me to start new line
in the equation.
>          \displaystyle% just to see the difference
>          \sum_{x=1}^n x^2    & \text{if I am true}
                                         ~~ this & never seems to give
me the alignment that I need.
>     }
> \stopformula


any idea. thanks a lot!!!

Best,
Fei

Re: ntg-context Digest, Vol 11, Issue 29

[Otared Kavian]

At 10:48 -0700 14/05/05, Fei He wrote:
>Hi all,
>
>I have a math equation question too. This has made me pulling my hair
>off, for a while. Please see below:
>(snip)
>
>
>
>                                     ~~ this & never seems to give
>me the alignment that I need.
>>      }
>  > \stopformula
>

Hi,

I think the point is to use a \cr after each line of aligned text in \cases.
On my installation the following works fine:

\usemodule[amsl]
\starttext

\startformula
      {\bf f(x)} =
      \cases{
        \sum_{x=1}^n x      &\quad if I am false \cr
        \displaystyle % just to see the difference
        \sum_{x=1}^n x^2    &\quad \text{if I am true} \cr
      }
\stopformula

\stoptext

Note that I added a \quad  after each "&" in order to have a little 
more space: however this is not essential.

Best regards: OK