Generate uniformly distributed random numbers
The Uniform Random Number block generates uniformly distributed random numbers over an interval that you specify. To generate normally distributed random numbers, use the Random Number block.
You can generate a repeatable sequence using any Uniform Random Number block with the same nonnegative seed and parameters. The seed resets to the specified value each time a simulation starts.
Avoid integrating a random signal, because solvers must integrate relatively smooth signals. Instead, use the Band-Limited White Noise block.
The numeric parameters of this block must have the same dimensions after scalar expansion. If you select the Interpret vector parameters as 1-D check box and the numeric parameters are row or column vectors after scalar expansion, the block outputs a 1-D signal. If you clear the Interpret vector parameters as 1-D check box, the block outputs a signal of the same dimensionality as the parameters.
The Uniform Random Number block accepts and outputs a real signal
For more information, see Data Types Supported by Simulink in the Simulink® documentation.
Specify the minimum of the interval. The default is
Specify the maximum of the interval. The default is
Specify the starting seed for the random number generator. The
The seed must be 0 or a positive integer. Output is repeatable for a given seed.
Specify the time interval between samples. The default is
See Specify Sample Time in
the Simulink documentation for more information.
If you select this check box and the other parameters are row or column vectors after scalar expansion, the block outputs a 1-D signal. Otherwise, the block outputs a signal of the same dimensionality as the other parameters. For more information, see Determining the Output Dimensions of Source Blocks in the Simulink documentation.
Specified in the Sample time parameter
The generator algorithm is identical to the one used in MATLAB® Version
4.0 by the
For details on the
mcg16807 algorithm, see Choosing a Random Number Generator (MATLAB) in the MATLAB documentation.
To use other algorithms supported by MATLAB in a Simulink model, generate a set 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, see Creating and Controlling a Random Number Stream (MATLAB). To create multiple independent streams using MATLAB, see Multiple Streams (MATLAB)
Using multiple seeds to generate multiple parallel independent
streams for a generator algorithm is not recommended for the
Instead, use the method described above.