### MATLAB Tutor

#### Part 1: Elementary Calculations

To send each command entry instruction to MATLAB for processing, press the RETURN or ENTER key on your keyboard.

1. In the MATLAB workspace, at the prompt, type

2 + 3

and then press RETURN or ENTER.
2. Enter

2 - 3
3. Enter

2*3
4. Enter

6/3
5. Enter

2^3

Now you know how to add, subtract, multiply, divide, and raise a number to a power in MATLAB – much the same way you do with a calculator or with other software packages.

The most recent result is always stored in a variable called ans (for ‘answer’). Only the very latest result is stored there.

1. Enter

ans

Observe that your last result is still there.
2. Enter

2*ans

You can compute with the result stored in ans in the same way that you can with any number.
3. Press the up arrow once, and then press Enter.
4. Press the up arrow several times, and note what happens. You can recover all your previous commands and re-execute them if you desire.
5. Enter

sqrt(5)
6. Enter

pi
7. Enter

i

You can use the right and left arrows on the keyboard to move right and left to edit a command line. Thus, you can correct mistakes by recalling a command with the up arrow and editing to correct it. You can type over a symbol you want to change or use the backspace key to delete it.

1. Use the up arrow to recover the command sqrt(5). Edit it using the right and left arrows and compute sqrt(8+pi).
2. Enter

format long

and then enter

pi
3. Enter

format short

and then enter

pi
4. Enter

format short e

and ask for the value of pi.
5. Enter

format rational

and ask for the value of pi.
6. Finally, for real fun, enter

format hex

and ask for the value of pi.

Unless you especially want to see the rest of your answers displayed in hexadecimal (base 16) form, change back to

format short

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