Arguments
numOfSamples
non-negative integer, number of samples to be plotted
sampleWidth
non-negative numeric, width of rectangle in inch for each sample,
default 0.1
columnPadding
non-negative numeric, padding width in inch between two samples,
default 0.025
sampleHeight
non-negative numeric, height of rectangle in inchfor each sample,
default 0.4
geneNameWidth
non-negative numeric, width of gene labeling area in inch, default 1