qwmatrixPlot: Parameter matrix plot
In USGS-R/WQ-Review: Discrete water-quality data review and exploration toolbox

Takes output data object from readNWISodbc and prints a parameter matrix plot

1	qwmatrixPlot(qw.data, site.selection, plotparm)

`qw.data`	A qw.data object generated from readNWISodbc
`site.selection`	A character vector of site IDs to plot
`plotparm`	A character vector of parameters to plot

data("exampleData",package="WQReview")
qwmatrixPlot(qw.data=qw.data, 
             site.selection = "06733000", 
             plotparm = c("00915","00945","00095"))