Plot surfaces with matrices

I have the informations and I did the graphic using the commands:

t=4;

a1=[1 2 8 9 12]; a2=[1 2 8 9 12]; b1=[-2 0 2 7 8]; b2=[2 4 10 12 15]; c1=[-5 -1 1 5 7]; c2=[3 5 11 13 15];

figure(1)

k=1:1:t+1;

plot3(k-1,a1,k-k+1,'k*-',k-1,a2,k-k+1,'k*-',k-1,b1,k-k+0.5,'b*-',k-1,b2,k-k+0.5,'b*-',k-1,c1,k-k+0,'r*-',k-1,c2,k-k+0,'r*-')

xlabel('k')

ylabel('x_1')

zlabel('\alpha')

legend('(\alpha=1)','(\alpha=1)','(\alpha=0.5)','(\alpha=0.5)','(\alpha=0)','(\alpha=0)')

I wanted a surface and not a graphic 3D. The surface would be built connecting the points (making planes) which would give a "triangle" over the period k.

I tried to use the comands "mesh" or "surf" or "stem3" of matlab but did not work.

Thanks.

Answer 1

[KSSV]

Surf gives you squares. If you want triangles you have to check Delaunay ...