Randomize Statement

Initialises the random-number generator used by the Rnd function.


Randomise [Number]


Number: Any integer value. Used as seed to initialise the random-number generator. Equal seeds result in equal random-number sequences by the Rnd function. If the parameter is omitted, the Randomize statement will be ignored.

Note Icon

Unless a predictable sequence of numbers is desired, there is no need to use the Randomize statement, as the random-number generator will be initialised automatically at first use – it will be seeded using a system-provided random-number generator that produces uniformly-distributed, non-deterministic random numbers. If no such generator is available on the system, the system time will be used as seed.

The Randomize statement affects BASIC's Rnd function only. Other random-number generators (for example the Calc's RAND() function, etc.) are not affected by it.

Error codes:

5 Invalid procedure call


Sub ExampleRandomize
Dim iCount As Integer, iVar As Integer, sText As String
Dim iSpectral(10) As Integer
    Randomize 2^14-1
    For iCount = 1 To 1000
    iVar = Int(10 * Rnd) ' Range from 0 to 9
        iSpectral(iVar) = iSpectral(iVar) +1
    Next iCount
    sText = " | "
    For iCount = 0 To 9
        sText = sText & iSpectral(iCount) & " | "
    Next iCount
    MsgBox sText,0,"Spectral Distribution"
End Sub

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