## Enter Statements in Command Window

As you work in MATLAB®, you can enter individual statements in the Command Window. For example, create a variable named `a` by typing this statement at the command line:

`a = 1`

MATLAB immediately adds variable `a` to the workspace and displays the result in the Command Window.

```a = 1```

When you do not specify an output variable, MATLAB uses the variable `ans`, short for answer, to store the results of your calculation.

`sin(a)`
```ans = 0.8415```

The value of `ans` changes with every command that returns an output value that is not assigned to a variable.

If you end a statement with a semicolon, MATLAB performs the computation, but suppresses the display of output in the Command Window.

`b = 2;`

To enter multiple statements on multiple lines before running any of the statements, use Shift+Enter between statements. This action is unnecessary when you enter a paired keyword statement on multiple lines, such as `for` and `end`.

You also can enter more than one statement on the same line by separating statements. To distinguish between commands, end each one with a comma or semicolon. Commands that end with a comma display their results, while commands that end with a semicolon do not. For example, enter the following three statements at the command line:

`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```

MATLAB displays only the values of `A` and `C` in the Command Window.

To recall previous lines in the Command Window, press the up- and down-arrow keys, ↑ and ↓. Press the arrow keys either at an empty command line or after you type the first few characters of a command. For example, to recall the command ```b = 2```, type `b`, and then press the up-arrow key.

To clear a command from the Command Window without executing it, press the Escape (Esc) key.

You can evaluate any statement already in the Command Window. Select the statement, right-click, and then select Evaluate Selection.

In the Command Window, you also can execute only a portion of the code currently at the command prompt. To evaluate a portion of the entered code, select the code, and then press Enter.

For example, select a portion of the following code:

`hello`