Performance of SamSPECTRAL on synthetic data. (a) This synthetic two dimensional data consists of a normal distribution with 30,000 points, four normal distribution each with 300 points and a uniform background noise with 4000 points. (b) Around 3000 sample points are picked up by faithful sampling. These are distributed almost uniformly in the space, therefore, almost all information about density will be lost if one considers only the samples points. (c) The final outcome of SamSPECTRAL confirms that the information about density could be retrieved by properly assigning weights to the edges of the graph. The high density cluster is shown in red and the surrounding sparser clusters are shown in yellow, light blue, green and black.
Zare et al. BMC Bioinformatics 2010 11:403 doi:10.1186/1471-2105-11-403