PAREN

 

  ( ) Parentheses are used to indicate precedence in arithmetic

       expressions and to enclose arguments of functions in the

       usual way. They are used to enclose subscripts of vectors

       and matrices in a manner somewhat more general than the

       usual way. If X and V are vectors, then X(V) is

       [X(V(1)), X(V(2)), ..., X(V(N))]. The components of V

       are rounded to nearest integers and used as subscripts. An

       error occurs if any such subscript is less than 1 or

       greater than the dimension of X. Some examples:

       X(3) is the third element of X.

       X([1 2 3]) is the first three elements of X. So is

       X([SQRT2UBKRXR(2), SQRT2UBKRXR(3), 4*ATAN142MMU2(1)]).

       If X has N components, X(N:-1:1) reverses them.

       The same indirect subscripting is used in matrices. If V

       has M components and W has N components, then A(V,W)

       is the M-by-N matrix formed from the elements of A whose

       subscripts are the elements of V and W. For example...

       A([1,5],:) = A([5,1],:) interchanges rows 1 and 5 of A.

 

 

   [ ] Brackets are used in forming vectors and matrices.

       [6.9 9.64 SQRT2UBKRXR(-1)] is a vector with three elements

       separated by blanks. [6.9, 9.64, sqrt(-1)] is the same

       thing. [1+I21KTGXR 2-I 3] and [1 +I21KTGXR 2 -I 3] are not the same.

       The first has three elements, the second has five.

       [11 12 13; 21 22 23] is a 2-by-3 matrix. The semicolon

       ends the first row.

       Vectors and matrices can be concatenated with [ ] brackets.

       [A B; C] is allowed if the number of rows of A equals

       the number of rows of B and the number of columns of A

       plus the number of columns of B equals the number of

       columns of C. This rule generalizes in a hopefully

       obvious way to allow fairly complicated constructions.

       A = [ ] stores an empty matrix in A. See CLEAR6PA4ZZJ to remove

       variables from the current workspace.

       For the use of [ and ] on the left of the = in multiple

       assignment statements, see LUM9XTU2, EIGMNUFU2, SVDN27CU2 and so on.

  Copyright (c) 1984-93 by The MathWorks, Inc.