In Tableau, to draw Marks on a view,
one needs Rows in the datasource.
To draw a grid of 5 x 5 = 25 Marks,
a datasource should be created
that contains 25 rows. Or at least two ;-)
The latter (creating a grid view using just a 2-row dataset)
would require padding the data (a sort of data densification).
I've used Bins for that. The values on the densified Marks
in the padded table view are drawn using Table Calculations.
Your single-value data set could be just a Parameter.
Please find the attached as an example.
Grid_v10.2_YF.twbx 12.3 KB