Re: Math align question

[Aditya Mahajan <adityam@umich.edu>]

On Sun, 26 Aug 2007, WN wrote:

> Aditya,
>
> This confuses me, I thought when using 3 columns I have to set n=3 otherwise 
> I get errors about extra tab found etc.
> However doing as you suggested, seems to work.

This is due to the m key. m=2 tells context that there are two blocks
of equations. n=2 says that each block has two columns. So, in all 
there should be n*m = 4 \NC in the equation (I had only put three, 
which led to the wrong equation number alignment).

> Then another question, the formula numbering is not aligned with the other 
> formula's in my text
> like in the code below. How can I force the sub formula numbering to be right 
> aligned ?

See above: This was due to mistake in my code. This works. (Though it 
will be nice if such mistakes do not cause these kinds of errors)

\def\ms{\,}
\starttext

\placeformula[calcb-chapter4-eqn2]
\startformula
f(x) = \sum_{n = - \infty}^{+\infty} c_{n} e^{\displaystyle i n
\frac{\pi}{L} x} \quad \text{,} \quad c_{n} = \frac{1}{2L}
\int\limits_{-L}^{L} f(x) \ms e^{- \displaystyle in\frac{\pi}{L} x } 
dx
\stopformula

Formula number is not right aligned with the previous formula
\placesubformula
\startformula
\startalign[n=2,m=2,distance=2em]
%\startalign[n=3]
\NC f(x) \NC = \frac{1}{2\pi} \int\limits_{-\infty}^{+\infty} g(y) \ms
e^{i y x} \ms dy \NC\NC (x \in \reals) \NR[calcb-chapter4-eqn5:i][i]
\NC g(y) \NC = \int\limits_{-\infty}^{+\infty} f(x) \ms e^{-i y x} d x
\NC\NC ( y \in \reals) \NR[calcb-chapter4-eqn5:ii][ii]
\NC \int\limits_{-\infty}^{+\infty} |f(x)|^{2} dx \NC = 
\frac{1}{2\pi}
\int\limits_{-\infty}^{+\infty} \Big| g(y) \Big|^{2} \ms d y \NC\NC
\quad
\NR[calcb-chapter4-eqn5:iii][iii]
\stopalign
\stopformula
\stoptext


Do you know about subformulas? For example,

\setupsubformulas[conversion=romannumerals]
\def\ms{\,}

\starttext

\startsubformulas[calcb-chapter-4-eqn5]
   \placeformula
   \startformula \startalign[n=2,m=2,distance=2em]
       \NC f(x) \EQ \frac{1}{2\pi} \int\limits_{-\infty}^{+\infty} g(y) \ms
           e^{i y x} \ms dy
       \NC\NC (x \in \reals)
           \NR[calcb-chapter4-eqn5:i]
       \NC g(y) \EQ \int\limits_{-\infty}^{+\infty} f(x) \ms e^{-i y x} d x
       \NC\NC ( y \in \reals)
           \NR[calcb-chapter4-eqn5:ii]
       \NC \int\limits_{-\infty}^{+\infty} |f(x)|^{2} dx
       \EQ \frac{1}{2\pi} \int\limits_{-\infty}^{+\infty}
           \Big| g(y) \Big|^{2} \ms d y
       \NC\NC
           \NR[calcb-chapter4-eqn5:iii]
   \stopalign \stopformula
\stopsubformulas

You can also refer to the whole equation~\in[calcb-chapter-4-eqn5], or 
an individual number~\in[calcb-chapter4-eqn5:iii].

\stoptext

BTW, why no \ms before dx, and a \ms before dy?

Aditya



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