MATLAB课程：代码示例之Programming（四）

是 否 +2 论坛币

k人 参与回答

经管之家送您一份

应届毕业生专属福利!

求职就业群

赵安豆老师微信：zhaoandou666

经管之家联合CDA

送您一个全额奖学金名额~ !

立即领取

感谢您参与论坛问题回答

经管之家送您两个论坛币！

+2 论坛币

MATLAB课程：代码示例之Programming（四）

Anonymous Functions

This example shows how to define functions at the command line with anonymous functions.

Integrating a Function

Consider the function 10*x.

If we want to allow any multiplier of x, not just 10, we might create a variable g (where g is initially set to 10), and create a new function

Let's do this in MATLAB® by creating a function handle h.

g = 10;h = @(x) g*x;

You can integrate the function by passing its handle to the INTEGRAL function.

integral(h,1,10)


ans =  495.0000

Consider another function:

Create a function handle to this function where alpha = 0.9.

alpha = 0.9;f = @(x) sin(alpha*x);

Plot the function and shade the area under it.

x = 0:pi/100:pi;area(x,f(x)); % You can evaluate f without fevaltitle('f(x) = sin(\alpha x), \alpha =.9');

We can use the INTEGRAL function to calculate the area under the function between a range of values.

integral(f,0,pi)


ans =    2.1678


Minimizing a Function

Consider the function:

where a = 1, b = -2, and c = 1

Create a function handle for it.

a = 1;b = -2;c = 1;f = @(x)(a*x.^2+b*x+c);


ezplot(f); % Plot the functiontitle('f(x)=ax^2+bx+c, a=1,b=-2,c=1');hold on;% Find and plot the minimumminimum = fminbnd(f,-2,2);       % We can pass the function handle directly                                 % to the minimization routineplot(minimum,f(minimum),'d');    % We can evaluate the function without                                 % using fevalgrid;hold off;

2D Functions

We can create handles to functions of many variables

a = pi;b = 15;f = @(x,y) (a*x+b*y);ezsurf(f);title('f(x,y) = ax+by, a = \pi, b = 15');

Function Composition

We can also create handles to functions of functions

f = @(x) x.^2;g = @(x) 3*x;h = @(x) g(f(x));h(3)


ans =    27

扫码加我 拉你入群

请注明：姓名-公司-职位

以便审核进群资格，未注明则拒绝

分享0 收藏0 回帖

关键词：Programming MATLAB课程 Program MATLAB atlab MATLAB课程 代码示例 Programming AnonymousFunctions

人生处处皆学问。。