codPlot: Diagnostic plots for CodelinkSet object.
In codelink: Manipulation of Codelink microarray data

This function performs several types of diagnostic plots using information from CodelinkSet objects.

1	codPlot(object, array, what = "ma", ...)

`object`	a CodelinkSet object.
`array`	The array to use for plotting (by default array=1).
`what`	the type of plot (by default ma).
`...`	additional arguments passed to the appropriate functions.

Plot types:

scatter: Scatter plot of the selected array intensities vs. the median array, or a second array if specified.
ma: MA plot of the selected array intensities vs. the median array, or a second array if specified. In the x-axis the value of A (mean abundance; A = Array1 + Array2) is plotted. In the y-axis the value of M (difference; M = Array1 - Array2) is plotted.
density: The distribution of intensities for each array in the dataset is plotted as a kernel density.
image: If the logical position of the probes in the array are available, this plot produces a pseudoimage of the array. The values of the "intensity", "bg" or "snr" can be selected with the 'signal' parameter (default signal="bg"). Color range can be controled with 'high' and 'low' parameters.