\\ Preparing matrix A for Latex. p="l", "c" or "r".
t_latexm (A,p="r") = {my (text,n,m,q);
[n,m]=matsize(A); q=t_word(vector(m,i,p),,"");
text=Strprintf("$\\begin{array} {%s}",q);
for (i=1,n,text=t_word([text,"\n",t_latexv(A[i,])]));
t_word([text,"\n","\\end{array}$"])}

\\ Preparing vector v for Latex.
t_latexv (v) = {my (w);
w=vector(#v-1,i,"&"); t_word([t_word(t_shuffle(w,v)),"\\\\"])}