Answer by F. Pantigny for Boxed rectangles or squares for 4 submatrix into a...
The key highlight is defined previously in the document (documentation of nicematrix).For the construction you want, consider first the following...
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I have taken this code from the documentation of nicematrix package to the pag. 44/208 version 5.12 of at the date of 2021/03/10.In the meantime I have this error of compilation: why? (I have the...
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