\\ cellwidth in mm.
\\ To use with colortbl in Latex.
t_colortable (A,cellwidth=1,stretch=1.75) = {my (n,m);
[n,m]=matsize(A); t=cellwidth/4.236;
B=matrix(n,m,i,j,\
     Strprintf("\\cellcolor{%s}%s",A[i,j], if (j==m,"\\\\","&")));
B=t_word(B,,""); as=t*stretch;
a=Strprintf("{\\setlength{\\tabcolsep}{%.2fmm}",cellwidth/2);
b=Strprintf("\\renewcommand{\\arraystretch}{%.2f}",as);
c=Strprintf("\\begin{tabular}{*{%d}{l}}",m);
d="\\end{tabular}}";
B=t_word([a,b,c,B,d],,"\n"); B;}