Command Window

Enter statements at the command line

Description

The Command Window enables you to enter individual statements at the command line, indicated by the prompt (>>). As you enter statements, the Command Window displays the results.

For example, to create the variable a, type a = 1 at the command line and press Enter. MATLAB^® adds the variable to the workspace and displays the result in the Command Window. To suppress the display of output, end statements with a semicolon, for example, a = 1;.

If you do not specify an output variable, MATLAB uses the variable ans, short for answer, to store the results of your calculation. The value of ans changes with every command that returns an output value that is not assigned to a variable.

This table describes some additional actions that you can perform in the Command Window.

Action	How to Perform the Action
Enter multiple statements on multiple lines before running any of the statements.	Enter the multiple statements at the command line, pressing Shift+Enter between statements. This key combination is unnecessary when you enter a paired keyword statement on multiple lines, such as `for` and `end`.
Clear a statement from the command line without executing it.	Press the Escape (Esc) key.
Recall previous statements.	Press the Up arrow ↑ key. The Command History window opens and displays a log of previous statements. To recall a specific statement, type any part of the statement and then press the Up arrow key. For example, to recall the command `b = 2`, type `b`, and then press the Up arrow key.
Clear the Command Window.	Call the `clc` function. To clear the Command Window without deleting any text, call the `home` function instead. Calling the `home` function moves the cursor to the upper-left corner of the Command Window and scrolls all visible text out of view, giving the appearance of clearing the screen without deleting any text.
Evaluate a statement already in the Command Window.	Select a statement, right-click, and then select Evaluate Selection.
Execute only a portion of the code currently at the command line.	Select the code at the command line and press Enter.

Open the Command Window

The Command Window is always open. To show the Command Window if it is hidden, click its icon in the sidebar. For example, if the Command Window is in its default location at the bottom of the MATLAB desktop, click the Command Window icon in the bottom sidebar.

Command Window with the bottom sidebar underneath it. The Command Window icon in the bottom sidebar is circled in red.

To move the Command Window to the left, right, or bottom of the desktop, drag it or its icon to the new location. To move it to the center of the desktop, click the Command Window actions button at the top of the Command Window and select Move Command Window > Center. To undock the Command Window, select Undock Command Window.

To restore the Command Window to its default location and size, go to the Home tab, and in the Environment section, click Layout. Then, select from one of the preconfigured desktop layout options.

Examples

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Enter Statements in the Command Window

Create variables and call functions in the Command Window.

Create a variable named a by typing this statement at the command line. MATLAB adds the variable a to the workspace and displays the result in the Command Window.

a = 1

a = 1

Calculate the sine of a by calling the sin function without specifying an output variable. MATLAB uses the variable ans to store the result of the calculation.

sin(a)

ans = 0.8415

Create a variable named b and end the statement with a semicolon. MATLAB performs the computation but suppresses the display of output in the Command Window.

b = a + 2;

Enter multiple statements on the same line. Separate the statements by ending each one with a comma or semicolon. Statements that end with a comma display their results, while statements that end with a semicolon do not.

A = magic(5),  B = ones(5) * 4.7;  C = A./B

A =

    17    24     1     8    15
    23     5     7    14    16
     4     6    13    20    22
    10    12    19    21     3
    11    18    25     2     9


C =

    3.6170    5.1064    0.2128    1.7021    3.1915
    4.8936    1.0638    1.4894    2.9787    3.4043
    0.8511    1.2766    2.7660    4.2553    4.6809
    2.1277    2.5532    4.0426    4.4681    0.6383
    2.3404    3.8298    5.3191    0.4255    1.9149

Select the Command Window After Creating a Plot

Create a line plot and then bring focus back to the Command Window.

Create a line plot by typing these statements at the command line. MATLAB creates a figure containing the line plot. Focus moves to the figure.

x = 0:pi/100:2*pi;
y = sin(x);
plot(x,y)

Figure contains an axes object. The axes object contains an object of type line.

Bring focus back to the Command Window.

commandwindow

Programmatic Use

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`commandwindow`

commandwindow selects the MATLAB Command Window. For example, type commandwindow in your script or live script after a plotting command to bring focus back to the Command Window.

commandwindow is not supported when running MATLAB with the -nodesktop option.

Tips

To determine the number of columns and rows that appear in the Command Window in its current size, type matlab.desktop.commandwindow.size in the Command Window. MATLAB returns the number of columns and rows, respectively. For example:
```
matlab.desktop.commandwindow.size
```
```
ans =
   133    24
```
If the Set matrix display width to eighty columns Command Window setting is selected, the number of columns is 80. For more information, see Modify Command Window Settings.
To display text or the value of a variable in the Command Window, use the disp function. For example, this code creates a variable and displays its value in the Command Window.
```
A = [15 150];
disp(A)
```
```
    15   150
```
You also can use the fprintf function to display text.
To access previous commands and output in the Command Window scroll buffer region using the keyboard, press Shift+Tab. The cursor moves to the last output or command. Use the up arrow and down arrow keys to move up and down between previous commands and output within the scroll buffer region. To move back to the command prompt, press Tab. (since R2024a)

Version History

Introduced before R2006a