disp函数

Display value of variable

Syntax

disp(X)

Description

disp(X) displays the value of variable X without printing the variable name. Another way to display a variable is to type its name, which displays a leading “X =” before the value.

If a variable contains an empty array, disp returns without displaying anything.

Examples

Display Variable Values Create a variable with numbers and another variable with text. Display the value of each variable.

>> A = [15 150];

>> disp(A)

15 150

>> S = 'Hello World.';

>> disp(S)

Hello World.

Display Matrix with Column Labels Display a matrix and label the columns as Corn, Oats, and Hay.

>> disp(' Corn Oats Hay')

Corn Oats Hay

>> X = rand(5,3);

>> disp(X)

0.8147 0.0975 0.1576

0.9058 0.2785 0.9706

0.1270 0.5469 0.9572

0.9134 0.9575 0.4854

0.6324 0.9649 0.8003

Display Hyperlink in Command Window Display a link to a Web page by including HTML hyperlink code as input to disp. For example, display a link to the MathWorks® Web site.

>> X = 'MathWorks Web Site';

>> disp(X)

MathWorks Web Site

Display Multiple Variables on Same Line Here are three ways to display multiple variable values on the same line in the Command Window.

Concatenate multiple character vectors together using the [] operator. Convert any numeric values to characters using the num2str function. Use disp to display the result.

>> name = 'Alice';

>> age = 12;

>> X = [name,' will be ',num2str(age),' this year.'];

>> disp(X)

Alice will be 12 this year.

Use sprintf to create text, and then display it with disp.

>> name = 'Alice';

>> age = 12;

>> X = sprintf('%s will be %d this year.',name,age);

>> disp(X)

Alice will be 12 this year.

Use fprintf to directly display the text without creating a variable. However, to terminate the display properly, you must end the text with the newline (\n) metacharacter.

>> name = 'Alice';

>> age = 12;

>> fprintf('%s will be %d this year.\n',name,age);

Alice will be 12 this year.