# Re: [NTG-context] mathmatrix and grid

```On 10/10/2016 12:30 PM, Wolfgang Schuster wrote:
>> Henri Menke <mailto:henrime...@gmail.com>
>> 10. Oktober 2016 um 11:44
>> On 10/10/2016 11:24 AM, Wolfgang Schuster wrote:
>>>> Henri Menke <mailto:henrime...@gmail.com>
>>>> 30. September 2016 um 23:01
>>>> Dear list,
>>>>
>>>> I noticed that when using grid=both then the height of a mathmatrix is
>>>> rounded down for no apparent reason whereas the depth is rounded up
>>>> correctly. Visually it appears to me that the height should be rounded up
>>>> here. In the MWE I added a \vrule to show that the determined height of
>>>> the line definitely does not coincide with what one would expect.
>>>>
>>>> How can I fix that? MWE is below.
>>>>
>>>> Cheers, Henri
>>>>
>>>> ---
>>>>
>>>> \setuplayout[grid=both]
>>>> \showgrid
>>>>
>>>> \starttext
>>>>
>>>> \input knuth
>>>> \startformula
>>>> \vrule % make lineheight and depth visible
>>>> \startmathmatrix
>>>> \NC A \NR
>>>> \NC B \NR
>>>> \NC C \NR
>>>> \stopmathmatrix
>>>> \stopformula
>>>> \input tufte
>>>>
>>>> \stoptext
>>> The default spacing modell (3) before and after formulas breaks grid
>>> alignment
>>> because when you use another alternative (1 or 2) the alignment is correct.
>>
>> Dear Wolfgang,
>>
>> I appreciate your efforts but this does not change anything in my original
>> example.  For reference, I include my updated example
>>
> You can add a grid setting for the formula itself, e.g.
>
>     \setupformula[grid=tolerant]
>
> but you should add a blank line before \startformula, otherwise the setting
> for formula is applied to the last paragraph before it.```
```
Dear Wolfgang,

thanks again, this solution works nicely for me.  However, it only represents a
workaround.  Do you think it is possible to patch it somehow in the core?
Perhaps the definition of the mathmatrix has to be adjusted somehow (in
context/base/mkiv/math-ali.mkiv).

Cheers, Henri

>
> Wolfgang
>
>
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