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How do I get the Ti 85 to do random integers?

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Functions on the calculator are bold. Numbers you choose are in italics.

For random positive integers between 0 and n use the following:

int (rand * n) + 1


int is on [Math] [Num] F4

and rand is on [Math] [Prob] F4

rand returns a random number x between 0 and 1 such that 0 < x < 1.

int returns the integer portion of a number such that int 123.456 returns 123 and int -123.456 returns -124.

Posted on Jan 21, 2009

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How to turn 85.4 into a mixed fraction


Separate the number into its integer and fractional portions: the integer is 85 and the fraction is 0.4. Convert 0.4 to a fraction: 2/5. Combine the two: 85 2/5.

If you want to know how to do it on a particular calculator, please specify the make and model.

Sep 04, 2013 | Office Equipment & Supplies

1 Answer

How do i generate random integers with a ti 89 titanium?


Use the rand() function. If you give it a positive integer argument n, it will return a random integer in the range in the interval [1, n]. You'll find rand() in the MATH/PROBABILITY menu.

Dec 08, 2010 | Texas Instruments TI-89 Calculator

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How do I program the calculator to read random numbers 1-50?


The post answer the question concerning how to generate random integers. The example given is for rolling a dice. I am inserting the modification that treats your case at the end.

The random number generator function is called Ran# and can be accessed in RUN mode by pressing:
[OPTN] [F6] [F3] (PROB) [F4] to access the (Ran#) function
In the paragraph above, the bold text in square brackets indicates keypresses, while the text in parentheses represents the menus that appear at the bottom of the calculator screen. This also assumes there are no menus on the bottom of the screen when you begin. If PROB is already on the screen, then the [F6] key is not necessary, just press [F3] then [F4] at this point.

The Ran# function generates a random decimal number between 0 and 1. If you need to generate a number with a higher range, then there may be extra steps involved. For example, to choose a random number between 0 and 100, you would enter:
Ran#×100 or Ran#(100)

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Let's say you want to simulate a dice roll, where you get an integer between 1 and 6. Your first step would be to do:
Ran#×6
This will give you a random decimal number between 0 and 6. But we need an integer, not a decimal. To make it an integer, you would change this to:
Int(Ran#×6)

Press [OPTN] [F6] [F4] (NUM) [F2] to access the (Int)

This now gives you an integer between 0 and 5. We just need to add 1 to the result.
Int(Ran#×6)+1
The result should be an integer between 1 and 6.

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To generate random number between 1 and 50
Int(Ran#×50)+1

Jul 16, 2010 | Casio FX-115ES Scientific Calculator

2 Answers

Is there a function on the TI-30XA that will generate random nubmers?


No such function my ***!

Just click prb --> RAND randint(
If you want a random integer from 1 to ten, randint(1,10
Then you just keep clicking enter to get different numbers.

Dec 07, 2009 | Texas Instruments TI-30XA Calculator

1 Answer

Error 23 stat


Quoting from page B-7 of the Guidebook:

-----
You are attempting a stat calculation with lists that are not appropriate; for example, you are requesting a statistical analysis with fewer than two statistical data points. The frequency (y value) for a 1-VAR analysis must be an integer >= 0.
------

If you simply want 1-variable statistics for two sets of data, you'll have to calculate them separately.

Oct 20, 2009 | Texas Instruments TI-85 Calculator

1 Answer

[Stat] - Data numbers (frequency) < 1 (not integer) on TI 85 Calc


Frequencies are always integers. They indicate how many times that particular data value came up. The data values may be non-integers.

As an example, let's say you're measuring the weights of widgets. You may have 3 widgets weighing 1.1 kg, 5 widgets weighing 1.2 kg, and 2 widgets weighing 1.3 kg.

Note that the data are non-integers (1.1, 1.2, 1.3) but the frequencies are integers (3, 5, 2).

Apr 01, 2009 | Texas Instruments TI-85 Calculator

1 Answer

@ symbol


According to the TI-89 Guidebook:

This notation indicates an “arbitrary integer” that represents any integer. When an arbitrary integer occurs multiple times in the same session, each occurrence is numbered consecutively. After it reaches 255, arbitrary integer consecutive numbering restarts at @n0.

Hope this helps. If you need any more info just ask away! :)

Jan 21, 2009 | Texas Instruments TI-89 Calculator

1 Answer

I NEED HELP


Hello,
The command randInt( is designed to give you RANDOM integer numbers chosen (AT RAMDOM) in a certain range.
Suppose you ask your friend to give you 8 integer numbers chosen between 1 and say 731). Can you guess beforehand what his/her answer is going to be? You can claim irregularity if one of the numbers is 732 or 1000, but you cannot say my answer is supposed to come out such and such. Do you see the analogy. Try saying that to the Lottery guys.

Hope it clarifies things.


Jan 18, 2009 | Texas Instruments TI-30 XIIS Calculator

1 Answer

The Greatest Integer Function (int)


The greatest integer function (also called a step function) is actually a piecewise defined function with a special definition. The function has the notation f(x)=||x|| or f(x)=[[x]] when it is written, but the TI-83 and the TI-84 designate this function by using f(x)=int(x) and is found in the MATH NUM menu. This function is the greatest integer less than or equal to x. So, f(1)=1 and f(1.4)=1. Since this is a piece-wise function you should use DOT mode.

Mar 21, 2008 | Texas Instruments TI-84 Plus Calculator

2 Answers

Statistics


Random number generators on computers are not really random. They need to be "seeded". If you seed the random number generator with the same seed each time you will generate the same list of numbers. A common technique in computer programming is to seed the random number generator with a value like the number of seconds that has occurred since midnight. This gives you the illusion of real random numbers.

Look up the word "Seed" in your calculator documentation and it will most likely tell you how this is accomplished on the TI calculators.

Nov 20, 2007 | Texas Instruments TI-83 Plus Calculator

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