tailieunhanh - matlab primer 6th edition phần 4

đường cong được định nghĩa parametrically Âm mưu của các đường cong parametrically được xác định cũng có thể được điên Những gì bạn thấy là một hình ảnh của nơi Kết quả D là một giải pháp trong biến Chức năng lập trình hướng đối tượng cao cấp vị trí còn kiểm soát ánh sáng và phần còn lại | function. X is a starting guess. The value of b returned is neDr a point where fun changes sign. For eXample bisect sin 3 is pi. Note the use of the function handle sin. An optional third input argument sets a tolerance for the relative accuracy of the result. The default is eps. An optional second output argument gives a matrix containing a trace of the steps the rows are of the form c f c @. if nargin 3 default tolerance tol eps end trace nargout 2 if x 0 dx X 20 else dx 1 20 end a X - dx fa feval fun a b x dx fb feval fun b if trace steps a fa b fb@ end find a change of sign while fa_ 0 fb 0 dx 2 dx a x - dx fa feval fun a if trace steps steps a fa@@ end if fa 0 fb 0 break end o 2002 by CRC Press LLC b X dx fb feval fun b if trace steps steps b fb@@ end end main loop while abs b-a 2 tol max abs b l c a b-a 2 fc fevai fun c if trace steps steps c fc@@ end if fb 0 fc 0 b c n fb fc else a c fa fc end end Some of MATLAB s functions are built in others are distributed as M-files. The actual listing of any non-built-in M-file MATLAB s or your own can be viewed with the MATLAB command type functionname. Try entering type eig type vander and type rank. Name resolution When MATLAB comes upon a new name it resolves it into a specific variable or function by checking to see if it is a variable a built-in function a file in the current directory or a file in the MATLAB path in order of the directories listed in the path . MATLAB uses the first variable function or file it encounters with the specified name. There are other cases see Help MATLAB using o 2002 by CRC Press LLC MATLAB Development Envi ronment workspace Path and File operations search Path. You can use the command which to find out what a name is. Try this clear i which i i 3 _ which i Error messages Error messages are best displayed with the function error. For example A rand 4 3 m n@ size A if m a n error A must be square end aborts execution of an M-file if the matrix A is not square. This is a .