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Re: Mathematica 9: bug in merging cells
Posted:
Dec 5, 2012 3:10 AM


I'm seeing exactly the same cellmerge bug in Mathematica 9 under OS X (10.8.2).
It has nothing to do with the (* comment *) per se. Exactly the same thing happens if in the first cell you replace the comment line with a blank line.
On the other hand, I don't get any error with copyandpaste, whether with the (* comment *) or with just a blank line there.
On Dec 4, 2012, at 4:14 AM, Fred Simons <f.h.simons@tue.nl> wrote:
> When writing a larger program, I usually test the single steps in > separate cells, then merge these cells and localize the variables by
> wrapping the contents of the merged cells in a Module. By doing so in
> Mathematica 9, due to a bug in merging cells, I lost a lot of code. I
> reported this bug to WRI two weeks ago. It is not yet repaired in the
> new release, so I thought I would mention this annoying bug here as well. > > This is an example (Mathematica 9 for Windows, I am not aware if this
> happens for other systems too). > > Construct two input cells, the first one containing > > a=1; > (* comment *) > b=2; > > and the second one > > c=3; > > When merging these two cells the contents ending with the comment is
> shown in an orange rectangle, with the error message that there is a
> RowBox with an invalid first argument. I cannot see any reason why this > merging of cells could not be undone with ctrlZ, but it cannot and > therefore part of my code was gone. > > In this simple example I could see how to fix it. Toggle ctrlE for > seeing the box structure. Place a } just behind the RowBox with the > comment and a { behind the very first RowBox[, that is followed on the > next line with another RowBox. > > During writing this message, I found that the same happens when you try > to copy and paste the first cell. > > Fred Simons > Eindhoven University of Technology
 Murray Eisenberg murray@math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower phone 413 5491020 (H) University of Massachusetts 413 5452838 (W) 710 North Pleasant Street fax 413 5451801 Amherst, MA 010039305



