Problem 2029. Convert vector datasets to plot with imagesc instead of scatter
For large datasets this allows much faster plotting.
An irregular 2D spatial sampling is provided in x and y vectors with a data point to plot in vector d. A bin size is also provded in vector b=[dx,dy]
Return a 2D matrix M with minimal empty cells with the correct spatial relationship of d and last value only retained in the event of duplicates.
Return G, a 2D matrix with d binned in rows and columns
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