Hi,

I think I am using the latest context version

> texexec --version
TeXExec 5.4.3 - ConTeXt / PRAGMA ADE 1997-2005

               texexec : TeXExec 5.4.3 - ConTeXt / PRAGMA ADE 1997-2005
               texutil : TeXUtil 9.0.1 - ConTeXt / PRAGMA ADE 1992-2006
                   tex : pdfeTeX, 3.141592-1.30.6-2.2 (Web2C 7.5.5)
               context : ver: 2006.03.20 10:19
               cont-en : ver: 2006.03.20 10:19  fmt: 2006.3.21  mes: english


When I compile your  code, it works. However my code , which I think, is similar, doesn't work.
I  cannot see any difference in the setup. I must be doing something basically wrong ???

Here is an excerpt  from my code
\def\mathrm#1{ {\rm #1}}
\def\done#1#2{ \frac{ \mathrm{d}  #1}{\mathrm{d} \mathrm{#2}} }
\def\dtwo#1#2{ \frac{\mathrm{d}^{2}  #1}{\mathrm{d} \mathrm{#2}^{2}} }
\starttext
Als op het tijdstip $t_{0}$ plaats $\vec{r}_{0}$ en snelheid $v_{0}$ zijn gegeven, 
dan kan de plaats $\vec{r}$ van een deeltje op ieder tijdstip worden berekend met de
vergelijkingen
\placeformula[eqn1]
\startformula
\startalign[n=3]
\vec{v} & = & \done{\vec{r}}{t}    \quad \quad \vec{r} - \vec{r}_{0} = \int_{t_{0}}^{t} \vec{v} \: dt \\
\stopalign
\stopformula
\placeformula[eqn2]
\startformula
\startalign[n=3]
\vec{a} & = & \done{\vec{v}}{t}    \quad \quad \vec{v} - \vec{v}_{0} = \int_{t_{0}}^{t} \vec{a} \: dt  \\
\stopalign
\stopformula
Voor $\vec{a}$ constant volgt uit \in[eqn2] 
\startformula
\vec{v} = \vec{v}_{0} + \vec{a} \: (t - t_0)
\stopformula
en hieruit met behulp van \in[eqn1] 
\stoptext

Wim


adityam@umich.edu wrote:
On Tue, 21 Mar 2006, WN wrote:

  
Hi,

I am getting unknown references when I use
\startformula
\startalign[n=3]
.... Some math ......
\stopalign
\stopformula
in conjunction with
\placeformula[eqn1]
\startformula
.... math ..
\stopformula
See \in[eqn1] .... <----------- unknown reference

It has something to do with the formulanumber not set, I know, but how 
do I fix this in the above ??
    

Which context version are you using? The following compiles correctly on 
live.contextgarden.net

\starttext
\startformula \startalign[n=3]
  \NC a \NC b \NC d \NR
  \NC a \NC b \NC d \NR
\stopalign \stopformula

in conjunction with
\placeformula[eqn1]
  \startformula
    a = b
   \stopformula
See \in[eqn1] \unknown

\stoptext

See if this works for you.

Aditya
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