The manual says math environment need not be in \[ \]. \[ \begin{matrix} 1&d\\ d&d\\ \end{matrix} \] When I put mouse point on `begin' , I can get preview image through C-c C-x C-l. When I put mouse point on `matrix' , I get two identical matrix with a square between them. When I put mouse point on `1&d' , I get a square and \[ at above \] at below . Thanks 2009/8/11 Carsten Dominik > > On Aug 11, 2009, at 3:41 PM, Nick Dokos wrote: > > waterloo wrote: >> >> Excuse me . >>> I put the following latex code in an org file , and put point in it ,C-c >>> C-x C-l. It don't produce the correct image. There is only an square >>> appearing . The latex environment is include in amsmath package, which is >>> include in Org Format Latex Header defautly. >>> >>> >>> \begin{matrix} >>> 1&d\\ >>> d&d\\ >>> \end{matrix} >>> >>> >> I cannot be sure whether "waterloo" sees the same problem (from his >> description, it seems that he gets just an empty square which indicates >> additional/different problems - maybe missing the dvipng program?), >> > > Yes, this seems to be a different problem. Maybe the problem is thatthe > matrix environment must be inside a math environment? > > > but >> I do see a problem. Here is the org file: >> >> ,---- >> | #+LaTeX_HEADER: \usepackage{amsmath} >> > > This is actually not necessary, I was mistaken here. > > | >> | * foo >> | >> | \[ >> | \begin{matrix} >> | 1&d\\ >> | d&d\\ >> | \end{matrix} >> | \] >> | >> `---- >> >> I can export this to LaTeX just fine (and I need the additional header, >> at least in that case - I have not tried without it). But when I try the >> preview C-c C-x C-l on the fragment, I get the preview of the matrix >> twice with an empty square separating the two instances. I attach a PNG >> image of the result. I checked the image that is produced in the ltxpng >> subdirectory: it's just the image of the matrix, no problem there. >> > > Hmm, another fun and interesting bug! > > Fixed now. Thanks. > > - Carsten > >