[texhax] Behavior of \vtop,\vbox, and \vcenter

Geoff Russell geoffrey.russell at gmail.com
Thu Dec 20 04:02:42 CET 2007

On Dec 20, 2007 11:05 AM, Michael Barr <barr at math.mcgill.ca> wrote:
> The funny behavior is clear from the example below:
>   $$  \vbox{\hrule height 100pt width 1pt}\eqno(*) $$
>   $$  \vtop{\hrule height 100pt width 1pt}\eqno(*) $$

\vtop aligns the baseline of the first line in a box with the next
baseline. So its doing
what it is supposed to do.

Geoff Russell

>   $$  \vcenter{\hrule height 100pt width 1pt}\eqno(*) $$
>               \bye
> a plain tex file.  The first one aligns the eqno with the bottom of the
> rule, as expected and the third one aligns it along the center, also as
> expected.  But the second one also aligns it with the bottom, not the top
> of the rule, not as I expect at any rate.  The problem I have is not, of
> course, with rules, but with xy-pic diagrams, but it is evidently not an
> xy-pic problem.  But any solution that involves giving the rules depth
> instead of height is not relevant.
> Michael Barr
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