checks for all nonzero elements
checks for any nonzero elements
returns a matrix, , that is the same size as the input matrix and such that .
returns the number of missing values
returns the number of nonmissing values
returns the number of unique values
evaluates a logical matrix and returns values based on whether each element is true or false
returns the number of rows and columns of a matrix
returns 1 if the argument is an empty matrix (zero rows and columns) and 1 otherwise
finds indices for the nonzero elements of a matrix
finds the number of columns of a matrix
finds the size of an element
finds the number of rows of a matrix
returns a matrix, , that is the same size as the input matrix and such that .
determines the type of a matrix