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From: eijkhout@s41.csrd.uiuc.edu (Victor Eijkhout)
Newsgroups: comp.text.tex
Subject: Re: How do I correct for Underfull \vbox ?
Message-ID: <1990Nov16.194545.10655@csrd.uiuc.edu>
Date: 16 Nov 90 19:45:45 GMT
References: <1990Nov16.150302.17811@rigel.econ.uga.edu>
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Organization: UIUC Center for Supercomputing Research and Development
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glenn@rigel.econ.uga.edu (Glenn F. Leavell) writes:

>Specifically, I often get this error:
>	Underfull \vbox (badness 10000) has occurred while \output is active
>Then, TeX adds extra lines between my paragraphs to stretch out the page.

First, the extra space between paragraphs is not an error but a feature.
There is a parameter \parskip which is usually 0pt plus .1pt, meaning
that it will not stretch much, but in case of emergency (I suspect 
that you have a page with only text and no whitespace) it will stretch
that however far is necessary. Your problem is (probably) that
your \vsize is not an integral multiple of the \baselineskip, meaning
that you get in trouble if you have a page without any explicit
vertical white space.

Easiest solution is to calculate \vsize from the number of lines
that you want to fit on the page. You may also set \vfuzz to 
something like 5pt, but that's not exactly elegant.

And if you just set \parskip=0pt the space between paragraphs
will not stretch. You will stil get the error message, but no
visible manifestation of it. (This is not what 	I recommend,
by the way).

Victor.