pred any?
any? (X)

    Returns true (one) if any element of X is non-zero.  Otherwise, returns
    false (zero).  X must be a matrix or a scalar.


pred compact?
compact? (A)

    Returns true (one) if A is a compact-storage matrix.  Otherwise, returns
    false (zero).


pred every?
every? (X)

    Returns true (one) if every element of X is non-zero.  Otherwise, returns
    false (zero).  X must be a matrix or a scalar.


pred matrix?
matrix? (A)

    Returns true (one) if A is a matrix (and not a scalar).  Otherwise,
    returns false (zero).


pred null?
null? (A)

    Returns true (one) if A is null (has not been assigned a value).
    Otherwise, returns false (zero).


pred scalar?
scalar? (A)

    Returns true (one) if A is a scalar.  Otherwise, returns false (zero).


pred symmetric?
symmetric? (X)

    Returns true (one) if any X is a symmetric matrix or a scalar.  Otherwise,
    false (zero).  X must be a matrix or a scalar.