Rainflow_Batch

RBCreate

# randΒΆ

rand returns random numbers with uniform distribution.

rmRand = rand()
rmRand = rand(ssGenerator)
rmRand = rand(nRows, nColumns)
rmRand = rand(nRows, nColumns, ssGenerator)
rmRand = rand(rvSize)
rmRand = rand(rvSize, ssGenerator)

Return Value

rmRand is a real matrix.

Parameters

nRows

nRows is the number of rows.

nColumns

nColumns is the number of columns.

rvSize

rvSize is a vector with two elements. rvSize[1] is the number of rows, rvSize[2] is the number of columns.

ssGenerator

Is one of the following strings ([a,b] := a <= x <= b, (a,b) := a < x < b):

 “mt” Use the Mersenne-Twister generator (default). “mt” is equal to “mt:real1”. “mt:real1” generates a random number on [0,1]-real-interval. “mt:real2” generates a random number on [0,1)-real-interval. “mt:real3” generates a random number on (0,1)-real-interval. “mt:int31” generates a random number on [0,0x7fffffff]-interval. “mt:int32” generates a random number on [0,0xffffffff]-interval. “mt:res53” generates a random number on [0,1) with 53-bit resolution. “ranlib” generates a random number on (0,1)-real-interval.

Example

```* srand("test")
1.0000
* rand(3, 3)
*   0.5536     0.7214     0.6267
0.0735     0.9892     0.8892
0.4024     0.0891     0.5894
```

The following function generates of random normal distribution using the Box-Mueller method (Gauss distribution):

```def randn(nRows, nColumn)
{
return sqrt( -2.0 * log(1.0 - rand(nRows, nColumn))) .* cos(2 * PI * rand(nRows, nColumn));
}
```
```A C-program for MT19937, with initialization improved 2002/1/26.
Coded by Takuji Nishimura and Makoto Matsumoto.
Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. The names of its contributors may not be used to endorse or promote
products derived from this software without specific prior written
permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
```

History

Version Description
5.14.0 New parameter ssGenerator