Creates a plot representing the layout of a MinION flow cell. Each circle
represents an individual channel with the intensity relecting a specified
sequencing metric. This function is a more generalised version of
layoutPlot, allowing the user to map any value the like on
the channel layout.
Usage
muxHeatmap(data, zValue)
Arguments
data
A data.frame or data.table. Should have at least two columns,
one of which has the name 'channel'.
zValue
Character string specifying the name of the column to be used
for the colour scaling.