amsl: startcases/stopcases

amsl: startcases/stopcases

[David Munger]

Hello Giuseppe,


I'm having a little trouble with the cases in amsl.

Compiling this:

\[
  f(x) =
  \startcases
    0        & \text{if $x < -\epsilon$} \\
    \frac12  & \text{if $x >  \epsilon$}
  \stopcases
\]

results in an error around the \frac. Changing it to \dfrac makes the  
input compile ok, but typesets the cases in an ugly manner with really  
narrow spacing.

Is there some way of telling startcases/stopcases to behave in display  
mode?

Thanks in advance,


David

Re: amsl: startcases/stopcases

[Giuseppe Bilotta]

Thursday, May 20, 2004 David Munger wrote:

> Hello Giuseppe,


> I'm having a little trouble with the cases in amsl.

> Compiling this:

> \[
>   f(x) =
>   \startcases
>     0        & \text{if $x < -\epsilon$} \\
>     \frac12  & \text{if $x >  \epsilon$}
>   \stopcases
> \]

> results in an error around the \frac.

Hello David, sorry for the delay.

The problem is caused by \frac being defined in the newmat
module as

%D Better:

\def\frac#1#2{\mathematics{\genfrac{}{}{}\donothing{#1}{#2}}}


If you comment that line, it will compile flawlessly.

Hans, why would you want to allow \frac in text mode?

> Changing it to \dfrac makes the input compile ok, but
> typesets the cases in an ugly manner with really narrow
> spacing.

(Yes.)

> Is there some way of telling startcases/stopcases to behave in display
> mode?

Yup, I just changed a couple of things and now we have a
\startbigcases ... \stopbigcases for this. Will upload new
version soon.

-- 
Giuseppe "Oblomov" Bilotta

Re : amsl: startcases/stopcases

[David Munger]

> > Is there some way of telling startcases/stopcases to behave in
> display
> > mode?
> 
> Yup, I just changed a couple of things and now we have a
> \startbigcases ... \stopbigcases for this. Will upload new
> version soon.

Oh, great! I'm really looking forward to get this new version. By the  
way, would you be so kind to include some multiline equation  
environment? Something like (or better than)

\[
  first part of very long equation
  \eqbreak
  second part of very long equation
  \eqbreak
  third part of very long equation
\]

which I achieve at the moment by doing

\[
  \startalign
    first part of very long equation
    \hskip 1.5em
    \\ \hfill
    second part of very long equation
    \\ \hfill
    third and part of very long equation
  \stopalign
\]

But this does not work as well I wish. I'd like to substitute the  
'\hskip 1.5 em' after the first line for a '\hfill' so that it always  
be the leftmost line, but the latter does nothing at all. So I have to  
put a '\hskip' and tweak the distance by hand.


Thanks for you help,


David

Re: Re : [NTG-context] amsl: startcases/stopcases

[Giuseppe Bilotta]

Tuesday, May 25, 2004 David Munger wrote:

>> > Is there some way of telling startcases/stopcases to behave in
>> display
>> > mode?
>> 
>> Yup, I just changed a couple of things and now we have a
>> \startbigcases ... \stopbigcases for this. Will upload new
>> version soon.

> Oh, great! I'm really looking forward to get this new version. By the
> way, would you be so kind to include some multiline equation
> environment? Something like (or better than)

> \[
>   first part of very long equation
>   \eqbreak
>   second part of very long equation
>   \eqbreak
>   third part of very long equation
> \]

You want to use the nath module: all equations are multiline:

\[ a= b + \\
   c + d + \\
   e +
\]

You may want to look at the documentation for the nath package
in LaTeX about the use of \wall and \return for alignments
within multiline equations.

-- 
Giuseppe "Oblomov" Bilotta

Re : [NTG-context] Re: Re : amsl: startcases/stopcases

[David Munger]

> > Oh, great! I'm really looking forward to get this new version. By
> the
> > way, would you be so kind to include some multiline equation
> > environment? Something like (or better than)
> 
> > \[
> >   first part of very long equation
> >   \eqbreak
> >   second part of very long equation
> >   \eqbreak
> >   third part of very long equation
> > \]
> 
> You want to use the nath module: all equations are multiline:

Indeed, I used to like nath a lot, but as I pointed out in this thread
http://www.ntg.nl/pipermail/ntg-context/2004/005306.html
there are bugs which prevent me from using it at the moment.

Regards,

David

Re: Re : [NTG-context] Re: Re : [NTG-context] amsl: startcases/stopcases

[Giuseppe Bilotta]

Thursday, May 27, 2004 David Munger wrote:

> Indeed, I used to like nath a lot, but as I pointed out in this thread
> http://www.ntg.nl/pipermail/ntg-context/2004/005306.html
> there are bugs which prevent me from using it at the moment.

Yes, it's still in my TODO list. Sadly, I don't have enough
time to work on it these days :\

-- 
Giuseppe "Oblomov" Bilotta

Re : [NTG-context] Re: Re : [NTG-context] Re: Re : amsl: startcases/stopcases

[David Munger]

> > Indeed, I used to like nath a lot, but as I pointed out in this
> thread
> > http://www.ntg.nl/pipermail/ntg-context/2004/005306.html
> > there are bugs which prevent me from using it at the moment.
> 
> Yes, it's still in my TODO list. Sadly, I don't have enough
> time to work on it these days :\

What you've done so far is already a great piece of work. :) Without  
it, I wouldn't be writing my physics thesis using ConTeXt.

David

Re: Re : [NTG-context] Re: Re : [NTG-context] Re: Re : [NTG-context] amsl: startcases/stopcases

[Giuseppe Bilotta]

Friday, May 28, 2004 David Munger wrote:

>> > Indeed, I used to like nath a lot, but as I pointed out in this
>> thread
>> > http://www.ntg.nl/pipermail/ntg-context/2004/005306.html
>> > there are bugs which prevent me from using it at the moment.
>> 
>> Yes, it's still in my TODO list. Sadly, I don't have enough
>> time to work on it these days :\

> What you've done so far is already a great piece of work. :) Without
> it, I wouldn't be writing my physics thesis using ConTeXt.

Thank you. Of course most of the work has actually been done by
others so far, and my only job has been that of bringing things
together :)

-- 
Giuseppe "Oblomov" Bilotta