How to have two horizontal labels on a matrix

Question

Say I have created a matrix. And now I want to label both the columns and the rows. However, I want to have labels on both sides of the matrix.

I have tried the following:

documentclass[a4paper12pt]{article}
usepackage{geometry}
usepackage{blkarray}
usepackage{amsmath}
usepackage{xcolor}
usepackage{graphicx}

begin{document} 
[mathbf{Pairs} = 
begin{blockarray}{cc}
Transmitter & Receiver 
begin{block}{c(cc)c}
TX_1^C & (x,y) & (x,y) & BS   
TX_2^C & (x,y) & (x,y) & BS     
&vdots & vdots  
TX_{max}^C & (x,y) & (x,y) & BS  
BAhhline{......} 
TX_1^D & (x,y) & (x,y) &RX_1^D   
TX_2^D & (x,y) & (x,y) &RX_2^D   
&vdots & vdots   
TX_{ax}^D & (x,y) & (x,y) &RX_{max}^D 
end{block}
end{blockarray}
]

end{document}

TeXstudio returns the error miscplaced noalign. end{block}

Anyone know why?

Ignasi · Accepted Answer

I think your example contain some mistakes:

is missing at end of last line before end{block}

You say blockarray{cc} but begin{block}{c(cc)c}, therefore it should beblockarray{cccc}`.

Only one & appears between Transmitter and Receiver, I think they should be three &&&, but I'm not sure how you want to align these words.

documentclass[a4paper12pt]{article}
usepackage{geometry}
usepackage{blkarray}
usepackage{amsmath}
usepackage{xcolor}
usepackage{graphicx}

begin{document} 
[mathbf{Pairs} = 
begin{blockarray}{cccc}
Transmitter & &&  Receiver 
begin{block}{c(cc)c}
TX_1^C & (x,y) & (x,y) & BS   
TX_2^C & (x,y) & (x,y) & BS     
&vdots & vdots  
TX_{max}^C & (x,y) & (x,y) & BS  
BAhhline{....} 
TX_1^D & (x,y) & (x,y) &RX_1^D   
TX_2^D & (x,y) & (x,y) &RX_2^D   
&vdots & vdots   
TX_{ax}^D & (x,y) & (x,y) &RX_{max}^D 
end{block}
end{blockarray}
]

end{document}

F. Pantigny · Answer

You can do that with nicematrix.
documentclass[a4paper,12pt]{article}
usepackage{geometry}
usepackage{amsmath}
usepackage{nicematrix}

begin{document}

[mathbf{Pairs} = 
begin{NiceMatrix}[baseline=line-6,cell-space-limits=3pt]
text{emph{Transmitter}} & &&  text{emph{Receiver}} 
TX_1^C & (x,y) & (x,y) & BS   
TX_2^C & (x,y) & (x,y) & BS     
&Vdots & Vdots  
TX_{text{max}}^C & (x,y) & (x,y) & BS  
hdottedline
TX_1^D & (x,y) & (x,y) &RX_1^D   
TX_2^D & (x,y) & (x,y) &RX_2^D   
&Vdots & Vdots   
TX_{text{max}}^D & (x,y) & (x,y) &RX_{text{max}}^D 
CodeAfter
  SubMatrix({2-2}{arabic{iRow}-3})
end{NiceMatrix}
]

end{document}

You need several compilations (because nicematrix uses PGF/Tikz nodes under the hood).

How to have two horizontal labels on a matrix

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