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If A is a vector, all(A) returns logical true (1) if all of the elements are nonzero, and returns logical false (0) if one or more elements are zero. If A is a matrix, all(A) treats the columns of A as vectors, returning a row vector of 1s and 0s. If A is a multidimensional array, all(A) treats the values along the first non-singleton dimension as vectors, returning a logical condition for each vector. B = all(A,dim) tests along the dimension of A specified by scalar dim. 5) returns logical true (1) only where A is less than one half: 0 0 1 1 1 1 0 The all function reduces such a vector of logical conditions to a single condition.

Exclamation point. Indicates that the rest of the input line is issued as a command to the operating system. ) subsref(A,S). See help subsref. )= B subsasgn(A,S,B). See help subsasgn. Arithmetic, relational, and logical operators. 2-15 Colon : Purpose Colon : Description The colon is one of the most useful operators in MATLAB. It can create vectors, subscript arrays, and specify for iterations. ,k] j:i:k is empty if i > 0 and j > k or if i < 0 and j < k where i,j, and k are all scalars. Below are the definitions that govern the use of the colon to pick out selected rows, columns, and elements of vectors, matrices, and higher-dimensional arrays: 2-16 A(:,j) is the j-th column of A A(i,:) is the i-th row of A A(:,:) is the equivalent two-dimensional array.

They are also used to enclose subscripts of vectors and matrices in a manner somewhat more general than usual. , X(V(n))]. The components of V must be integers to be used as subscripts. An error occurs if any such subscript is less than 1 or greater than the size of X. Some examples are • X(3) is the third element of X. • X([1 2 3]) is the first three elements of X. See help paren for more information about ( ). If X has n components, X(n:–1:1) reverses them. The same indirect subscripting works in matrices.

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