Adds a pearson correlation value to the scatter plots

1 | ```
panelCor(x,y, digits=2, prefix="r=")
``` |

`x` |
matrix of x values |

`y` |
matrix of y values to correlate with x |

`digits` |
number of digits to display |

`prefix` |
The string prefix that should be display on the scatterplot panel |

1 2 3 4 5 | ```
#Calculate the median of a matrix omiting NAs
## Not run:
panelCor(x,y, digits=2, prefix="r=")
## End(Not run)
``` |

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