The randInt( Command Command Summary

Generates a random integer between min and max, inclusive, or a list of such numbers.

Command Syntax

randInt(min,max[,# of numbers])

Menu Location

Press:

1. MATH to access the math menu.
2. LEFT to access the PRB submenu.
3. 5 to select randInt(, or use arrows.

TI-83/84/+/SE

2 bytes

randInt(min,max) generates a uniformly-distributed pseudorandom integer between min and max inclusive. randInt(min,max,n) generates a list of n uniformly-distributed pseudorandom integers between min and max.

seed→rand affects the output of randInt(.

``````0→rand
0
randInt(1,10)
10
randInt(1,10,5)
{10 2 6 5 8}```
```

# Optimization

When the lower bound of randInt( is 0, you can replace it with int(#rand to save space. For example:

``````:randInt(0,12
can be
:int(13rand```
```

Similarly, if you don't want to include zero in the range, you can use a variant of 1-#int(#rand:

````:1-2int(2rand`
```

In this particular example, the only values that you will ever get are -1 or 1.

# Formulas

The value of randInt( for a given seed can be expressed in terms of rand:

randInt(A,B)=

• when A<B, A+int((B-A+1)rand
• otherwise, B+int((A-B+1)rand

This is identical to the output of randInt( in the sense that for the same seed, both expressions will generate the same random numbers.

# Error Conditions

• ERR:DOMAIN is thrown if any of the arguments is a decimal.
• ERR: DATA TYPE is given if you use imaginary numbers like 6i or something like Matrices or Lists. This error is used instead of ERR:DOMAIN for "i".

# Related Commands

.

Unless otherwise stated, the content of this page is licensed under Creative Commons Attribution-Noncommercial-No Derivative Works 2.5 License.