Hello everybody I'm trying to write an Rd file so that the resulting LaTeX-ed document includes a matrix. Here is the line in question: \deqn{ E_\theta\left( \begin{array}{cc} 1 & x\theta\\ x\theta & x^2\theta^2 \end{array}\right) }{ommitted: see dvi} which looks OK to me; the contents of the first curly brace produce the desired matrix in a regular .tex file. But it doesn't produce the desired matrix when included in an Rd file: on my system the ampersands show up literally, and the whole equation is on one line. I suspect that the backslashes and ampersands are being escaped somehow, and TeX isn't interpreting them as desired. How do I write an Rd file so that the output of R CMD Rd2dvi includes a nicely typeset matrix? -- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14 3ZH, UK tel 023-8059-7743