function fem2d_scalar_display_txyv ( prefix )

XY = load ( strcat ( prefix, '_nodes.txt'    ) );
T  = load ( strcat ( prefix, '_elements.txt' ) );

if ( min ( min ( T ) ) == 0 )
  T = T + 1;
end

V  = load ( strcat ( prefix, '_values.txt'   ) );

trisurf ( T, XY(:,1), XY(:,2), V )
