Description

The Random Number block generates normally distributed random numbers. To generate uniformly distributed random numbers, use theUniform Random Numberblock.

You can generate a repeatable sequence using any Random Number block with the same nonnegative seed and parameters. The seed resets to the specified value each time a simulation starts. By default, the block produces a sequence that has a mean of 0 and a variance of 1. To generate a vector of random numbers with the same mean and variance, specify theSeedparameter as a vector.

Avoid integrating a random signal, because solvers must integrate relatively smooth signals. Instead, use theBand-Limited White Noiseblock.

The numeric parameters of this block must have the same dimensions after scalar expansion. If you select theInterpret vector parameters as 1-Dcheck box and the numeric parameters are row or column vectors after scalar expansion, the block outputs a 1-D signal. If you clear theInterpret vector parameters as 1-Dcheck box, the block outputs a signal of the same dimensionality as the parameters.

Data Type Support

The Random Number block outputs a real signal of typedouble. For more information, seeData Types Supported by Simulinkin the Simulink^®documentation.

Parameters

Characteristics

The generator algorithm is identical to the one used in MATLAB Version 4.0 by therand和randnfunctions. For details on themcg16807algorithm, seeChoosing a Random Number Generator(MATLAB) in the MATLAB^®documentation.

To use other algorithms supported by MATLAB in a Simulink model, generate a stream of random numbers in MATLAB, and store the output as a .mat file. Use this .mat file as the random number input for your simulation. For more information, seeCreating and Controlling a Random Number Stream(MATLAB). To create multiple independent streams using MATLAB, seeMultiple Streams(MATLAB).

See Also

Uniform Random Number