Augmented matrix is not produced correctly

[Paul A. Rubin]

On 5/6/20 11:59 AM, Paul Smith wrote:
> On Wed, May 6, 2020 at 4:50 PM Paul A. Rubin <parubin73 at gmail.com> wrote:
>> I suspect that I have found a bug: When I do what I do at the attached
>> screenshot, I do not get what one would have expected (the vertical
>> line drawn between the first and the second column).
>>
>> This discussion may be relevant:
>>
>> https://tex.stackexchange.com/questions/299221/adding-vertical-line-equal-sign-to-augmented-bmatrix-without-using-array
>>
>> What version of LyX are you using? I get the vertical line using LyX 2.3.4.2 on Linux Mint.
> Thanks, Paul. I am using
>
> LyX Version 2.3.4.2
>
> on Fedora Linux 31.
>
> Have you selected the matrix decoration as [x], Paul?
>
> As soon as one does that, LyX uses bmatrix environment, with which it
> is impossible to get an augmented matrix.
>
> Paul
Sorry, missed that part. You're right, that does nuke the vertical line. 
A workaround is to use the [] math toolbar button to create the brackets 
and insert the matrix inside. It's not perfect -- there seems to be more 
white space between brackets and matrix -- but it's in the ballpark.

Paul