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From: =?iso-8859-1?Q?Martin_Kolar=EDk?= <martin@mii.cz>
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Subject: RE: values relative to \textwidth etc.
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> Is it possible to specify a value relative to a variable like \textwidth
> or \pageheight etc.  For example, is there a way to get 1/3 of \textwidth?

You always can use TeX's multiplying of dimension with constant like:

\setuplayout
  [leftmargin=0.33333\textwidth]

or for sophisticated expressions you can use ConTeXt's \dimexpr:

\setuplayout
  [leftmargin=\dimexpr(0.33333\textwidth+3cm+\topspace)]

Martin