Convert convexhull to stl file

I have a set of 3d coordiante points. How can i convert the convert the convex hull into stl file.

p = [113.6466  111.8984  112.4205  108.7094  113.4748  111.4158  113.5684 ];
q =[ 17.7346   12.7025   16.5175   18.2938   17.4362   18.4552   16.3848 ];
r = [56.0310   62.7279   56.1565   59.7253   66.1007   65.5010   56.0682 ];
k= convhull(p,q,r);
trisurf(k,p,q,r);

Answer 1

[KSSV]

p = [113.6466  111.8984  112.4205  108.7094  113.4748  111.4158  113.5684 ];
q =[ 17.7346   12.7025   16.5175   18.2938   17.4362   18.4552   16.3848 ];
r = [56.0310   62.7279   56.1565   59.7253   66.1007   65.5010   56.0682 ];
k= convhull(p,q,r);
trisurf(k,p,q,r);
tr = triangulation(k,[p' q' r']) ;
stlwrite(TR,'test.stl')

[CHANDRABHAN Singh]

Thank you @KSSV

[耀 谷]

Can your code work normally? I was prompted to use fileparts incorrectly when running the code

[CHANDRABHAN Singh]

@耀 谷 Yes. It is running very smooth.