You can easily remove an element (or a column in any dimension) from a normal matrix, but assigning that value (or range) empty. For example
A = 1:10 A(5) = 
1 2 3 4 6 7 8 9 10
You task is to find the shortest, elegant, way in Matlab to do the same for cell arrays. Regexp, eval, and other workarounds that trick mtree are considered stupid, and will not be appreciated.