The Command History window displays a log of statements that you ran in the current and previous MATLAB® sessions. The Command History lists the time and date of each session in your operating system's short date format, followed by the statements for that session. Brackets in the left margin indicate commands that are processed as a group. A colored mark precedes each command that generates an error.
To view the command history, press the up-arrow key, ↑, in the Command Window. To retrieve a command using a partial match, type any part of the command at the prompt, and then press the up-arrow key.
To dock or detach the Command History window, click , and then select an option. To view the Command History if it is closed: on the Home tab, in the Environment section, click Layout. Then, under Show, click Command History and select either Docked or Popup.
MATLAB saves statements that run in the Command Window
to the history file,
History.xml. These statements
include those you run using the Evaluate Selection item
on context menus in tools such as the Editor, Command History, and
Help browser. By default, MATLAB automatically saves the command
history file after each command. The history file does not include
every action taken in MATLAB. For example, modifications of values
in the Variables editor are not included in the Command History. All
entries remain until you delete them, or until the number of commands
in the history file exceeds the number of commands to save, as specified
in the Command History preferences. When the specified limit is reached, MATLAB automatically
deletes the oldest entries. By default, the Command History saves
You can select entries in the Command History window, and then perform the following actions for the selected entries.
How to Perform the Action
Create a script from a statement or statements.
Select an entry or entries, and then right-click and select Create Script or Create Live Script from the context menu. The Editor opens a new file that contains the commands you selected from the Command History window.
Rerun previous commands.
Do one of the following:
To extend the selection to include multiple commands, press Shift+↑.
Copy statements to another window.
Do one of the following:
Create a shortcut from a statement or statements.
Do one of the following:
Select the entries to delete, and then right-click and select Delete, or press the Delete key.
To delete all entries, click , and then select Clear Command History from the context menu. You cannot recall these entries.
MATLAB uses your operating system's short date format to display dates in the Command History window. To change the date format, for instance from MM/DD/YYYY to DD/MM/YYYY:
Change the short date format for your operating system as described in its documentation.
Note: Clearing the command history deletes all entries from the Command History window. You can no longer recall those entries in the Command Window.
You can exclude statements from the command history and specify
how many commands to save to the command history file,
History.xml. MATLAB uses
the command history file for both the Command History window and statement
recall in the Command Window.
Note: When you exclude statements from the command history file, you cannot recall them in the Command Window, nor can you view them in the Command History window.
You can also change the way you search for previously executed statements in the command history. Select from different search text matching options and change the way results are displayed in the Command History window.
To set Command History preferences, on the Home tab, in the Environment section, click Preferences. Select MATLAB > Command History, and then adjust the preference options as described in this table:
Select Save exit/quit commands to
Select Save consecutive duplicate commands to save consecutive executions of the same statement in the command history.
Select Don't save history file to prevent saving the command history across sessions. This option is useful when multiple users share the same machine. For example, the option prevents each user from viewing statements others have run.
Any entries predating the current session remain unless you first delete entries from the Command History window.
|Save last |
Select Match anywhere to retrieve statements that contain the search text in any location.
Select Match beginning to retrieve statements that begin with the search text. This option is selected by default.
|Select Match case to retrieve statements that match the case of the search text.|
|Select Filter matches to display only statements that match the search text. Clear Filter matches to display all previously executed statements and highlight the statements that match the search text.|
|Show||Select Show match toolbar to display a search toolbar at the top of the Command History window. Search for previously executed statements using the search field and change Match preferences using the provided buttons.|
|Select Show match locations to display yellow markers to the right of the scroll bar in the Command History window that indicate the location of matches throughout the command history.|
|Select Show execution time to display
an approximate execution time to the right of each statement. Times
display for any statements that takes longer than |