On 10/10/2009 2:25 PM, Duncan Murdoch wrote:
On 10/10/2009 8:07 AM, Mathieu Ribatet wrote:
Dear list,
I got an automatic email complaining than some of my packages didn't
pass 'R CMD check' for R-2.10.0 alpha anymore. Both of them make use of
the "cases" LaTeX environment.
Inspecting the log outputs I got:
LaTeX errors when creating PDF version.
This typically indicates Rd problems.
LaTeX errors found:
! Misplaced alignment tab character &.
I noticed that the Rd parser changed quite recently and that '#', '_'
and '&' must not be escaped according to "Writing R extensions".
However, the problematic .Rd portion seems (to me) OK
\deqn{\theta(h) =
\begin{cases}
u_\beta \left(\mu + \frac{\nu(h)}{\Gamma(1 - \xi)}
\right),&\xi \neq 0\\
\exp\left(\frac{\nu(h)}{\sigma}\right),&\xi = 0
\end{cases}
}{u_beta (mu + nu(h) / Gamma(1 - \xi)), if \xi < 1,
exp(nu(h)/sigma), otherwise}
One more followup: the problem appears to be in the "cases"
environment. If I rewrite that block using "array" instead, things are
fine:
\deqn{\theta(h) =
\left\{\begin{array}{ll}
u_\beta \left(\mu + \frac{\nu(h)}{\Gamma(1 - \xi)}
\right),&\xi \neq 0\\
\exp\left(\frac{\nu(h)}{\sigma}\right),&\xi = 0
\end{array}\right.
}{u_beta (mu + nu(h) / Gamma(1 - \xi)), if \xi < 1,
exp(nu(h)/sigma), otherwise}
This makes me think it's a bug in the LaTeX package that provides
"cases", or a conflict with our Rd.sty file, but I don't know which.
And the final answer: the "cases" environment is in the amsmath
package, which is not used by R. You need to use regular LaTeX, not
fancy stuff like that. (There's a \cases macro in LaTex, which doesn't
know what to do with alignment tabs: that's why you got the error you did.)
Duncan Murdoch