Plot the updated standard deviation of gene in every recorded Gibbs sampling iteration

1 | ```
mcmc_trace_plot(tau_g_chain, plot_file_name, index)
``` |

`tau_g_chain` |
The updated precision of each gene in each itertaion. A list with length 2, containing 2 matrices. Each row corresponds to the updated precision of the G1 or G2 genes in each recorded iteration. |

`plot_file_name` |
The name of the ".pdf" plot file |

`index` |
The index of genes/drugs whose standard deviation in each iteration of the Gibbs sampling is to be drawn in the trace plot. If there are G1 genes and G2 drugs in the dataset, "index" can be a vector with integer values ranging from 1 to (G1+G2). |

1 2 3 4 5 6 7 | ```
library(Rlab)
library(MASS)
library(coda)
library(ROCR)
data(tau_g_chain)
mcmc_trace_plot(tau_g_chain,plot_file_name="Demo_traceplot.pdf", index=1:10)
``` |

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