logical AND of the elements of an array
b=and(A), b=and(A,'*')
b=and(A,'r'), b=and(A,1)
b=and(A,'c'), b=and(A,2)
and(A) is the logical AND of elements of the boolean matrix A. and(A) returns %T (“true”) if all entries of A are %T.
and([]) returns %T.
y=and(A,’r’) (or, equivalently, y=and(A,1)) is the row-wise AND. It returns in each entry of the row vector y the AND of the rows of x (The AND is performed on the row index : y(j)= and(A(i,j),i=1,m)).
y=and(A,’c’) (or, equivalently, y=and(A,2)) is the column-wise AND. It returns in each entry of the column vector y the AND of the columns of x (The AND is performed on the column index: y(i)= and(A(i,j),j=1,n)).