Randomly generate a 4 X 4 stochastic matrix that satisfies Chargaff's second parity rule for dinucleotides.

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`labels` |
a vector of labels for the rows and columns of the matrix. By default, this is set to the set of four nucleotides a, c, g and t. |

This function randomly generates Stochastic matrices of the form

*
b1 b2 b3 1-(b1+b2+b3)
zb6 b4 1-(zb6+b4+zb3) zb3
zb5 1-(zb5+b4+zb2) b4 zb2
1-(b5+b6+b1) b5 b6 b1*

where *b1*, ..., *b6* are values in the interval (0,1) and
*z* is a positive number.

Such matrices characterize sequences of DNA that comply with Chargaff's second parity rule for dinucleotides. See the reference for further information.

A 4 X 4 stochastic matrix satisfying Chargaff's second parity rule. The rows and columns are labelled according to labels.

This function is only intended for obtaining samples of matrices complying with CSPR. It doe snot sample uniformly from the set of all such matrices and hence is not appropriate for simulation experiments requiring uniformly drawn samples.

Andrew Hart and Servet Mart<ed>nez

Hart, A.G. and Mart<ed>nez, S. (2011)
Statistical testing of Chargaff's second parity rule in bacterial genome sequences.
*Stoch. Models* **27(2)**, 1–46.

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