is possible to do hierarchical clustering with a 3D Matrix?

like title, it's possibile? I have this data file:

A=zeros(6,6,20);
A(:,:,1)=a;
A(:,:,2)=b;
A(:,:,3)=c;
A(:,:,4)=d;
A(:,:,5)=e;
A(:,:,6)=f;
A(:,:,7)=g;
A(:,:,8)=h;
A(:,:,9)=i;
A(:,:,10)=l;
A(:,:,11)=m;
A(:,:,12)=n;
A(:,:,13)=o;
A(:,:,14)=p;
A(:,:,15)=q;
A(:,:,16)=r;
A(:,:,17)=s;
A(:,:,18)=t;
A(:,:,19)=u;
A(:,:,20)=v;

[KSSV]

what is hierarchical clustering ?

[luca buonocore]

http://it.mathworks.com/help/stats/hierarchical-clustering.html

[KSSV]

Then you have the solution....what you have done so far?

[luca buonocore]

i have no solution, i'm a noob of matlab... you know what i mean! I'm trying to do a hierarchical clustering for a university work, but i find big iusse. One of my problem are the values of data. I have 20 data, and every data it's a 6x6 matrix. Now i don't know how to do... cause the analysis must give me 20 final values for clustering