Angle of ddots in an uneven matrix

Question

I have the following triangle matrix with zeroes on the diagonal

documentclass[a4paper]{memoir}
usepackage{amsmath}
begin{document}
[
M = begin{pmatrix}
    0 & a_{1,2} & a_{1,3}   & dots     & a_{1,n}   
      & 0       & a_{2,3}   & dots     & a_{2,n}   
      &         & 0         & ddots    & vdots    
      &         &           &           & 0
  end{pmatrix}
]
end{document}

The small problem I have now, is that the dots from ddots point from a_{2,3} to the last zero. This could lead to the impression that the diagonal is not given by the zeroes. Anyone an idea?

daleif · Accepted Answer

How about this

documentclass[a4paper]{memoir}
usepackage{amsmath}
begin{document}
[
M = begin{pmatrix}
    0 & a_{1,2} & a_{1,3}   & dots     & a_{1,n}   
      & 0       & a_{2,3}   & dots     & a_{2,n}   
      &         & 0         & ddots    & vdots    
      &         &           &     0      & a_{n-1,n}   
      &         &           &           & 0
  end{pmatrix}
]
end{document}

BTW: please post small compilable docs instead of sniplets. The less others have to add the more likely it is to get help.

F. Pantigny · Answer

With nicematrix:
documentclass[a4paper]{memoir}
usepackage{amsmath}
usepackage{nicematrix}
begin{document}
[
renewcommand{arraystretch}{1.3}
M = begin{pNiceArray}{ccwc{4mm}wc{7mm}wc{7mm}}[xdots/shorten=1mm]
    0 & a_{1,2} & a_{1,3}   & Cdots     & a_{1,n}   
      & 0       & a_{2,3}   & Cdots    & a_{2,n}   
      &         & Ddots    & Ddots    & Vdots    
      &         &           & 0         & a_{n-1,n}   
      &         &           &           & 0
  end{pNiceArray}
]
end{document}

Angle of ddots in an uneven matrix

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