zero length string
s = emptystr()
s = emptystr(a)
s = emptystr(m, n)
:a matrix of size m x n : :s A matrix of character strings : :m,n Integers :
Returns a matrix of zero length character strings
With no input argument returns a zero length character string.
With a matrix for input argument returns a zero length character strings matrix of the same size.
With two integer arguments returns a m x n zero length character strings matrix
x=emptystr();for k=1:10, x=x+','+`string`_(k);end