You can use convhulln
to compute the convex hull for dimensions grater than 2. If you want to plot the results, use trisurf
. See the sample code for your input below:
X = [x;y;z]'; %# involves a 3D point on each row
K = convhulln(X);
trisurf(K,X(:,1),X(:,2),X(:,3))