Random Number Generator

How to Generate Random Numberson the TI-84 Plus

In This Article

By Jeff McCalla, C. C. Edwards

It is likely that your TI-84 Plus calculator has a vast number of numbers arranged into a list, which is known as a random numbers table which it utilizes to generate random numbers.

Generating random integers

If you want to generate random integer,follow these steps:

  1. To turn on the randInt Wizard within the Math PROB menu, click If you're using a calculator like a TI-84 Plus, there isn't a wizard for the randint command. In order to use the command you must be familiar with how to use it: randint(lower, upper, [number of elements]).A wizard will make the entry of data simple. The wizard arranges data entered in a way that corresponds to the syntax of command. You can see the wizard on the initial screen. image1.jpg
  2. Enter the lower limit and upper limit you would like the number that you randomly choose be.You require a random number that ranges from 1 to 100. Enter [ENTER] or press the down-arrow to move to the next section of the wizard.
  3. Enter n to indicate how many random numbers you'd like to generate.Press [ENTER] several times to generate more random numbers as shown in the second screen.
  4. If you wish to generatea list of random integers you can change to the number n.See The third page in.

Generating random integerswith no repetition

Did you notice the integer 52, was chosen twice in the third screen? If you're making a list of random integers and want to eliminate repeats by using an alternative procedure. These are the steps to follow:

  1. To activate the randIntNoRep Wizard within the Math PROB menu, press image2.jpgSee in the very first screen.On the TI-84 Plus, the randIntNoRep command does not come with wizards that can assist you. The syntax for the command is randIntNoRep(lower,upper). In contrast to the TI-84 Plus C that you can't use, this command doesn't give you the option of adjusting to the amount of words. image3.jpg
  2. Input your upper limit and lower limit as well as enter n (the the number terms).See on the next screen.
  3. Enter [ENTER] until the numbers are generated.This is shown in the third screen.

Generating random decimals

It is easy to generate random decimal numbers, which are between 0 and 1. Press

Choose the rand command to choose the rand command Math Probability menu. Repeatly press [ENTER] to generate the random numbers. The first screen will illustrate this process.

To generate random numbers between 100 and 0 then utilize the rand command. It is an expressionlike 100*rand. See the second screen.

Seeding the generator of random numbers

Your calculator generates random numbers from an extensive list of numbers arranged in a list. This is the fun part. You can choose where on the list you want your calculator to start creating random numbers. It's called seedsing the random numbers.

Have a bit of fun with the number you pick for your calculator's seed. This is a great exercise! Calculate how many days you have been alive. Calculators come with commands to calculate that for you! You can follow these instructions:

  1. Use [2nd][0] to access the Catalog.Notice that your calculator is operating in Alpha mode, as shown by the blinking of the A in the cursor.
  2. To add the DBD( function to insert the function, press image6.jpgdbd stands for days in between dates.
  3. Enter your birth date as numbers in this application: MM.DDYY.Dates are required to be in the period between 1950 and 2049. This form, June 1, 1968 is entered as the number: 06.0168.
  4. Press [,].
  5. Input today's date as a number in this form: MM.DDYY. January 2, 2013 will be entered as the number 01.0213.
  6. Enter [ENTER] and find out the number of days you have spent alive.See your first display. Wow! 16,286 days is an awful lot older! image7.jpg

Here are the steps you need to follow to start your calculator:

  1. Enter the number that you will be employing to seed the calculator. 16286. Of course, you could utilize any number real to seed your calculator.
  2. Pressimage8.jpg
  3. To insert the rand command, press image9.jpg
  4. Enter [ENTER] to seed to your calculator.See the first line of The second screen.
  5. Try it! Try randInt( to generate random number.See the final line on your second screen.

Are you hoping to impress your acquaintances? Seed your calculator with results you have in mind. For example, if , for example, you intentionally seed your calculator using this number 16286, then the next three randomly generated numbers (from 1 to 1,000) that will be produced will be 197, and 213, as seen in the screen 3. Just don't share your secret!

About the Book Author

Jeff McCalla is a math teacher who teaches mathematics and science at St. Mary's Episcopal School in Memphis, TN. He is the co-founder of the TI-Nspire SuperUser group, and was awarded the Presidential Award for Excellence in Science & Mathematics Teaching. C.C. Edwards is an instructor who has delivered numerous workshops on using TI calculators.

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