/* Maxima tips http://www.cymric.jp/maxima/tips.html */ rowmult(X, n, c) := block([M], M:matrix(), for i:1 thru length(X) do if i=n then M:addrow(M, c*row(X, i)) else M:addrow(M, row(X, i)), M ); rowadd(X, n, m, c) := block([M], M:matrix(), for i:1 thru length(X) do if i=n then M:addrow(M, c * row(X, m) + row(X, i)) else M:addrow(M, row(X, i)), M ); rowch(X, m, n) := block([M], M:matrix(), for i:1 thru length(X) do if i=m then M:addrow(M, row(X, n)) else if i=n then M:addrow(M, row(X, m)) else M:addrow(M, row(X, i)), M ); colmult(X, n, c) := block([M], M:matrix(), for i:1 thru length(transpose(X)) do if i=n then M:addcol(M, c*col(X, i)) else M:addcol(M, col(X, i)), M ); coladd(X, n, m, c) := block([M], M:matrix(), for i:1 thru length(transpose(X)) do if i=n then M:addcol(M, c * col(X, m) + col(X, i)) else M:addcol(M, col(X, i)), M ); colch(X, m, n) := block([M], M:matrix(), for i:1 thru length(transpose(X)) do if i=m then M:addcol(M, col(X, n)) else if i=n then M:addcol(M, col(X, m)) else M:addcol(M, col(X, i)), M );