Hi Jeong,

If you are interested in using the commands defined in the old t-rsteps.tex for 
showing formulas or text step by step, below is an example I use (it works with 
mkii and mkiv). The input file I  use can be found here
        http://dl.dropbox.com/u/4316076/t-rsteps-ok.tex
but I attach it also to this message. 
The old « raw steps » is handy when one may need to go backward in the steps or 
when you want to show, say, the third line of your formula before the second 
line, but it has the disadvantage of creating one page per step.

\starttext

\setuppapersize[S6][S6]
\setuppagenumbering[state=stop]
\input t-rsteps-ok.tex
\setupinteraction[state=start] 
% uncomment the following when not needing teps
% \UseStepsfalse
% when using \UseStepstrue, we redefine \placeformula...
\ifx\UseStepstrue{\def\placeformula[#1]{\PlaceFormula[#1]}}\fi

\StartSteps[Formula with steps]

\startformula
\startalign
\Step{1}{\NC T(4) \NC = T(3) + 4 \NR} 
\Step{2}{\NC \NC= T(2) + 3 + 4 \NR}
\Step{3}{\NC \NC= T(1) + 2 + 3 + 4 \NR}
\Step{4}{\NC \NC= 1 + 2 + 3 + 4 = 10 \NR}
\stopalign
\stopformula
\StopSteps
\stoptext

Best regards: OK

Attachment: t-rsteps-ok.tex
Description: Binary data

On 13 mai 2011, at 02:13, Jeong Dalyoung wrote:

> Dear all,
> 
> I'd like to show the following formula line  by line in a presentation,
> For example, 
> \startformula\startalign
> \NC T(4) \NC = T(3) + 4 \NR
> \NC \NC= T(2) + 3 + 4 \NR
> \NC \NC= T(1) + 2 + 3 + 4 \NR
> \NC \NC= 1 + 2 + 3 + 4 = 10 \NR
> \stopalign\stopformula
> 
> 
> I tried to use \StartSteps and \StopSteps but not succeed.
> 
> \starttext
> \usemodule[pre-60]
> 
> \StartSteps
> \startformula\startalign
> \NC T(4) \NC = T(3) + 4 \NR\FlushStep %(nor \FlushStep\NR)
> \NC \NC= T(2) + 3 + 4 \NR\FlushStep
> \NC \NC= T(1) + 2 + 3 + 4 \NR\FlushStep
> \NC \NC= 1 + 2 + 3 + 4 = 10 \NR\FlushStep
> \stopalign\stopformula
> \StopSteps
> 
> \stoptext
> 
> Is there a way to do so?
> 
> Thank you.
> 
> Best regards,
> 
> Dalyoung
> ___________________________________________________________________________________
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> 
> maillist : [email protected] / http://www.ntg.nl/mailman/listinfo/ntg-context
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> ___________________________________________________________________________________


___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the 
Wiki!

maillist : [email protected] / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
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