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Set Command Window Preferences

You can customize the visual display and behavior of the Command Window and the command output within it using Command Window preferences.

General Preferences for the Command Window

You can specify what is displayed in the Command Window and how it is displayed and the default format of Datetime objects.

On the Home tab, in the Environment section, click Preferences. Select MATLAB > Command Window, and then adjust the options as described in the following table.

Some Command Window preferences are not available in MATLAB® Online™.

PreferenceUsage
Text display

Select a Numeric format option to specify the output format of numeric values in the Command Window.

For details, see Format Floating-Point Numbers.

Select a Line spacing option to specify whether blank lines appear in Command Window output. To suppress blank lines, select compact. To display blank lines, select loose.

Datetime format

Select a Locale option to specify the default input locale of the Datetime object. You also can enter a custom locale. For more information, including a list of common values, see datetime.

Select a Default date and time format option to specify the default format of the Datetime object. You also can enter a custom format. For more information, see the Format property for datetime arrays.

Select a Default date-only format option to specify the default date format of the Datetime object. You also can enter a custom format. For more information, see the Format property for datetime arrays.

Display

Select Wrap lines to make each line of input or output in the Command Window break into multiple lines to fit within the current width of the Command Window.

For details, see Wrap Lines of Code to Fit Window Width.

Select Set matrix display width to eighty columns to limit the width of matrix output.

If you also select Wrap lines, and the width of the Command Window is fewer than 80 characters, each row of 80 characters of matrix output wraps to fit within the width of the Command Window.

Select Show getting started message bar to display the Command Window message bar that provides links to introductory information.

Select Show function browser button to display the Function Browser button to the left of the prompt in the Command Window. You can use the Function Browser to search for MATLAB functions.

Select Suggest corrections for mistyped functions and variables to display suggestions in the Command Window. If you enter an undefined function, variable name, or MATLAB operator, MATLAB displays:

Did you mean:

followed by a suggested command at the command line. You can press Enter to execute that command or Esc to delete the suggestion.

Number of lines in command window scroll buffer specifies the maximum number of lines displayed in the Command Window. A larger scroll buffer provides a larger base for search features, but requires more memory. By default, the scroll buffer is set to 5,000 lines.

The scroll buffer size does not impact the number of lines that you can recall. By default, you can use the up arrow key ↑ to recall all lines shown in the Command History window, regardless of how many lines you see in the Command Window.

Tab key

Tab size specifies the number of spaces assigned to the tab key.

This setting does not apply if you have enabled tab completion for the Command Window or Editor. To enable or disable tab completion, on the Home tab, select Preferences > Keyboard.

Command Window Automatic Completions Preferences

You can change how MATLAB suggests and completes names in the Command Window.

On the Home tab, in the Environment section, click Preferences. Select MATLAB > Command Window > Automatic Completions, and then adjust the options as described in the following table.

PreferenceUsage
Suggestions and completions

Select Enable tab completion for MATLAB to suggest and complete names when you type the first few characters of the name and press the Tab key in the Command Window.

For more information, see Code Suggestions and Completions.

Select Tab key narrows completions for MATLAB to continue to reduce the list of possible names for completions as you type each additional character and press the Tab key.

Select Enable function hints for MATLAB to display function hints in the Command Window

When enabled, if you type a function name with an opening parenthesis, and then pause, a tooltip opens showing the basic syntax for the function. For example:

For more information, see Function Syntax Hints.

In MATLAB Online, for MATLAB to suggest and complete names as you type in the Command Window, select Show automatically. For MATLAB to suggest and complete names only after you press the Tab key, select Show on tab.

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