Rand function in PowerApps

Returns a pseudo-random number.

Description

The Rand function returns a pseudo-random number that's greater than or equal to 0 and less than 1.

Volatile Functions

Rand is a volatile function. Each time the function is evaluated it returns a different value.

When used in a data flow formula, a volatile function will only return a different value if the formula in which it appears is reevaluated. If nothing else changes in the formula then it will have the same value throughout the execution of your app.

For example, a label control with Label1.Text = Rand() will not change while your app is active. Only closing and reopening the app will result in a new value.

The function will be reevaluated if it is part of a formula in which something else has changed. For example, if we change our example to involve a slider control with Label1.Text = Slider1.Value + Rand() then a new random number is generated each time the Slider control's value changes and the label's text property is reevaluated. See below for this example.

When used in a behavior formula, Rand will be evaluated each time the behavior formula is evaluated. See below for an example.

Syntax

Rand()

Examples

Display a different random number as user input changes

  1. Add a Slider control, and rename it Slider1 if it has a different name.

  2. Add a Label control, and set its Text property to this formula:

    Slider1.Value + Rand()

    The label shows 50 (the default value for the slider) plus a random decimal:

    A screen displaying a label control with 50.741

  3. While holding down the Alt key, change the value of the slider.

    Every time you change the value of the slider, the decimal portion of the label shows a different random number:

    Four screens displaying a label control with four different random decimal values for each of four different slider settings 70.899, 84.667, 90.134, 99.690

Create a table of random numbers

  1. Add a Button control, and set its OnSelect property to this formula:

    ClearCollect( RandomNumbers, ForAll( [ 1, 2, 3, 4, 5 ], Rand() ))

    This formula creates a single-column table that's used to iterate five times, resulting in five random numbers.

  2. Add a Data table, set its Items property to RandomNumbers, and show the Value field.

    A screen showing a data table with five different decimal values 0.857, 0.105, 0.979, 0.167, 0.814

  3. While holding down the Alt key, select the button by clicking or tapping it.

    The data table shows five random decimal numbers:

    A screen showing a data table with five different decimal values 0.857, 0.105, 0.979, 0.167, 0.814

  4. Select the button again to show a different list of random numbers:

    The same screen showing a data table with a new set of five different decimal values 0.414, 0.128, 0.860, 0.303, 0.568

To generate a single random number instead of a table, use Set( RandomNumber, Rand() ).