problems to make a multiplot with the standard output setuped like graphic terminal

[fermin]

Hello:

I will be glad if somebody could helpme with the problem i get when i
execute this octave program "muelle1.m" thath calls to a function in the
file "ocil1.m"

Thankyou very much.

function oscil1 = cil (ci,t)
global k c
oscil1 = zeros (2,1);
x = ci (1);
v = ci(2);
oscil1 (1) = v;
oscil1 (2) = -k*x-c*v;
endfunction

global k c
k = 2;
c = 0.6;
y=lsode("oscil1",[0.5 1],[0:.1:50]);
gnuplot_has_multiplot = 1.0;
subplot(2,1,1)
title('Representacion de la Posicion y la Velocidad de un Oscilador 
Amortiguado')
xlabel('Tiempo')
ylabel('Amplitud')
plot(y(:,1),";POSICION;",y(:,2),";VELOCIDAD;")
subplot(2,1,2)
title('Representacion de la Posicion frente a la Velocidad de un Oscilador 
Amortiguado')
xlabel('Velocidad')
ylabel('Posicion')
plot(y(:,1),y(:,2),";POSICION FRENTE VELOCIDAD;")
gnuplot_has_multiplot = 1.0;
gset term gif
gset output "muelle15437.gif"
gnuplot_has_multiplot = 1.0;
replot