Sstrhsrtj

This is my first time asking a question on Stack Exchange, although I'm a frequent reader.

I tried to build a tabular that generates a sort of array, with indexes displayed above. This is the code:

$A = $

raisebox{10pt}{

  setcounter{N}{5}

  begin{tabular}{|*{5}{c|}}

     xintFor* #1 in {xintSeq{1}{value{N}}}do{xintifForFirst{tiny #1}{& mc{tiny #1}}}\

    hline

     $1$ & $3$ & $5$ & $7$ & $8$\

    hline

  end{tabular}

}

where newcommandmc[1]{multicolumn{1}{l}{#1}}.

I would like it to be exactly the way it is now, but without the first two vertical lines in the indexes row. If I use mc in the first block of xintifForFirst (as I did successfully for the second block) it doesn't compile and I can't understand why. The error I get is ! Misplaced omit.
multispan ->omit @multispan

Thanks in advance :-)

Edit: As suggested by Andrew I'm writing an example of the error I get:

documentclass{article}

usepackage{tabularx}

usepackage{xinttools}



newcounter{N}

newcommandmc[1]{multicolumn{1}{l}{#1}}



newcommand{myarray}[2]{

    raisebox{8pt}{

        begin{tabular}{|*{#1}{c|}}

            setcounter{N}{#1}

            xintFor* ##1 in {xintSeq{1}{value{N}}}do{xintifForFirst{mc{    tiny ##1}}{& mc{tiny ##1}}}\

            hline

            #2\

            hline

        end{tabular}

    }

}



begin{document}

    $B = $myarray{11}{$0$ & $0$ & $1$ & $0$ & $1$ & $0$ & $0$ & $1$ & $0$ & $1$ & $0$}

end{document}

I don't know what packages you need to load to get your code to compile with xint - I tried usepackage{xint} but this was not sufficient.

Would you consider a tikz solution that produces

using the code

documentclass{article}

usepackage{tikz}

tikzset{array/.style={rectangle, draw, minimum width=5mm}}

newcommandArray[1]{%

  tikz[baseline]{foreach x [count=c] in {#1} {

      node[array, label=above:{tiny c}]at (c/2,0){$x$};

    }

  }

}



begin{document}



$A = Array{1,3,5,7,8}$



end{document}

EDIT - adding colour

Adding colour is fairly straightforward. If you want to have different colours in each cell then you can produce:

using the code:

documentclass{article}

usepackage{xcolor}

usepackage{tikz}

tikzset{array/.style={rectangle, draw, minimum width=5mm}}

newcommandArray[1]{%

  tikz[baseline=(current bounding box.south)]{

    foreach x/col [count=c] in {#1} {

      node[array, fill=col!20, label=above:{tiny c}]at (c/2,0){$x$};

    }

  }

}



begin{document}



$A = Array{1/red,3/blue,5/white,7/green,8/white}$



end{document}

If you want the same colour in each cell then, assuming that the cell entries are always non-negative you can use an easier input syntax by using negative numbers for colour to produce

using the marginally more complicated code:

documentclass{article}

usepackage{xcolor}

usepackage{tikz}

tikzset{array/.style={rectangle, draw, minimum width=5mm}}

newcommandArray[1]{%

  tikz[baseline=(current bounding box.south)]{

    foreach x [count=c] in {#1} {

      ifnumx<0relax

        node[array, fill=blue!20, label=above:{tiny c}]at (c/2,0){$thenumexpr-xrelax$};

      else

        node[array, label=above:{tiny c}]at (c/2,0){$x$};

      fi

    }

  }

}



begin{document}



$A = Array{1,-3,5,-7,8}$



end{document}