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Bạn có thể cốt truyện e và f1, đồ họa sử dụng MATLAB, theo nhiều cách mà chúng ta sẽ khám phá trong các đồ họa phần sau trong chương này. Chúng tôi kết luận phần này bằng cách phúc khảo là một trong những cũng có thể định nghĩa các chức năng của hai hay nhiều biến. Ví dụ, một trong những điều sau đây | Managing Variables 17 ans 1 4 9 16 25 You can plot f and fl using MATLAB graphics in several ways that we will explore in the section Graphics later in this chapter. We conclude this section by remarking that one can also define functions of two or more variables. For example either of the following g @ x y x 2 y 2 g 1 2 gl inline x 2 y 2 x y g1 1 2 results in the answer 5. If instead you define g @ x y x. 2 y. 2 then you can evaluate on vectors thus g 1 2 34 ans 10 20 gives the values of the function at the points 1 3 and 2 4 . Managing Variables We have now encountered four different types of MATLAB data floating-point numbers strings symbolic expressions and functions. In a long MATLAB session it may be hard to remember the names and types of all the variables you have defined. You can type whos to see a summary of the names and types or classes of your currently defined variables. But before you do that first assign a pi b pi and c sym pi now type whos. Here s the output for the MATLAB session displayed in this chapter. whos Name Size Bytes Class A 3x4 96 double array X 1x31 248 double array Y 1x6 48 double array Z 1x4 32 double array a 1x1 8 double array ans 1x2 16 double array b 1x2 4 char array c 1x1 128 sym object d 1x1 8 double array f 1x1 16 function_handle array f1 1x1 824 inline object g 1x1 16 function_handle array g1 1x1 882 inline object u 1x1 126 sym object v 1x1 126 sym object w 1x1 138 sym object 18 Chapter2. MATLAB Basics x y 1x1 1x1 126 sym object 126 sym object Grand total is 183 elements using 2968 bytes The variables A X Y Z a and d were assigned numerical data and are reported as double array . That means that they are arrays of double-precision numbers in this case the arrays a and d are of size 1 X 1 i.e. scalars. The Bytes column shows how much computer memory is allocated to each variable. Also ans is numerical since the last unassigned output was a 1 X 2 vector. The variable b is a string reported as char array while the variables c u v
