This is sample code.
Is this what you want?
x = linspace(0,2*pi,20);
v1 = sin(x);
v2 = sin(x)/2;
v3 = sin(x)/3;
V = {v1,v2,v3};
for i=1:length(V)
figure(1);
plot(x,V{i});
hold on
end
xq = [1.5, 2.5, 3.5];
for i=1:length(V)
vq = interpn(x,V{i},xq(i));
plot(xq(i),vq,'o');
end