It's often necessary to typeset part of a document in landscape orientation; to achieve this, one needs not only to change the page dimensions, but also to instruct the output device to print the strange page differently.
There are two “ordinary” mechanisms for doing two slight variations of landscape typesetting:
sidewaystableenvironments which create floats that occupy a whole page.
Note that rotating has problems in a document that also
loads the float package, which recommended in other
answers in these FAQs, for example that on
float placement. The rotfloat package
loads rotating for you, and smooths the interaction with
- If you have a long sequence of things that need to be typeset in
landscape (perhaps a code listing, a wide
environment, or a huge table typeset using longtable or
supertabular), use the lscape package (or
pdflscape if you're generating PDF output, whether
using pdfLaTeX or
dvips and generating PDF from
that). Both packages define an environment
clears the current page and restarts typesetting in landscape
orientation (and clears the page at the end of the environment
before returning to portrait orientation).
No currently available package makes direct provision for typesetting in both portrait and landscape orientation on the same page (it's not the sort of thing that TeX is well set-up to do). If such behaviour was an absolute necessity, one might use the techniques described in "flowing text around figures", and would rotate the landscape portion using the rotation facilities of the graphics package. (Returning from landscape to portrait orientation would be somewhat easier: the portrait part of the page would be a bottom float at the end of the landscape section, with its content rotated.)
To set an entire document in landscape orientation, one might use
lscape around the whole document. A better option is the
landscape option of the geometry package; if you
also give it
geometry also emits the rotation instructions to cause the
output to be properly oriented. The memoir class has the same
facilities, in this respect, as does geometry.
A word of warning: most current TeX previewers do not honour rotation requests in DVI files. Your best bet is to convert your output to PostScript or to PDF, and to view these “final” forms with an appropriate viewer.