converts strings vector (or strings matrix) into a cell array of strings
c=cellstr(s)
strings vector, or strings matrix
returns a cell array of strings
If s is a row vector of strings then
cellstr(s) returns a
one-by-one cell array which contains one component (the
concatenation of all column components of s.
If s is a column vector of strings then
cellstr(s) converts s into
a cell array of strings which have the same size :
size(s,1)-by-one.
If s is a matrix of strings then for each
row i of s,
cellstr(s) concatenates all the components of the
ith rows of the matrix s (i.e
s(i,1), s(i,2),
s(i,3),...) and returns a
size(s,1)-by-one cell
array of strings.