Random number generation designed for cross-language usage.

A synchronized Tausworthe RNG usable in R and Python.

This program was created because I needed to have the same random numbers in both R and Python. Although both languages implement a Mersenne-Twister RNG, the implementations are so different that it is not possible to get the same random numbers with the same seed.

SyncRNG is a Tausworthe RNG implemented in `syncrng.c`

, and linked to both R
and Python. Since both use the same underlying C code, the random numbers will
be the same in both languages, provided the same seed is used.

You can read more about my motivations for creating this here.

First install the packages as stated under Installation. Then, in Python you can do::

```
from SyncRNG import SyncRNG
s = SyncRNG(seed=123456)
for i in range(10):
print(s.randi())
```

Similarly, after installing the R library you can do in R::

```
library(SyncRNG)
s <- SyncRNG(seed=123456)
for (i in 1:10) {
cat(s$randi(), '\n')
}
```

You'll notice that the random numbers are indeed the same.

R allows the user to define a custom random number generator, which is then
used for the common `runif`

and `rnorm`

functions in R. This has also been
implemented in SyncRNG as of version 1.3.0. To enable this, run::

```
library(SyncRNG)
set.seed(123456, 'user', 'user')
runif(10)
```

These numbers are between [0, 1) and multiplying by `2**32 - 1`

gives the
same results as above.

Installing the R package can be done through CRAN::

```
install.packages('SyncRNG')
```

The Python package can be installed using pip::

```
pip install syncrng
```

In both R and Python the following methods are available for the `SyncRNG`

class:

`randi()`

: generate a random integer on the interval [0, 2^32).`rand()`

: generate a random floating point number on the interval [0.0, 1.0)`randbelow(n)`

: generate a random integer below a given integer`n`

.`shuffle(x)`

: generate a permutation of a given list of numbers`x`

.

The random numbers are uniformly distributed on `[0, 2^32 - 1]`

.

- Allows using SyncRNG as a user-supplied random number generator in R. This
enables using the functions
`runif`

and`rnorm`

.