hong
2006-Oct-10 00:48 UTC
[R] function used to smooth the scatter plot and generate a density map
Dear R-helpers, I want to smooth a scatter plot (or 2d histogram) to generate the density map using a squared Euclidean kernel function, with each data point contributing a density of 1/(r*r + k) to each cell on the heatmap, where r*r?was the squared Euclidean distance between the coordinates of the cell and the coordinates of the point, and k was a constant smoothing factor. There is figure to demonstrate the process in the attachment. I don?t know if there function in some package can do this. I have used many keywords to search the R help files and the R project web but did not get the answer. Can anybody help me? Thank very much. Sincerely ?Honglin zhou ? College of Life Sciences Beijing Normal University Beijing, 100875 P. R. China