Example Weighted shading mode plot
Weighted mode selection
The Weighted shading mode () paints markers using colours indicating density at each pixel like the Density mode, but with an optional weighting coordinate. You can configure how the weighted coordinates are combined at each pixel to give the final weighted result. Depending on the configuration and actual point density, this can behave in some ways like Aux mode and in some ways like Density mode, but allows you to do things that are not possible in either.
The shading is done using the shared colour map. This colour map is used by all currently visible Weighted, Aux, Grid and SkyDensity layers. When at least one such layer is being plotted, the Aux Axis control is visible in the control panel, which allows you to configure the colour map, range, ramp display etc.
The options are:
The following options (some are more useful than others) are currently available:
sum: the sum of all weights
mean: the mean of all weights
median: the median of all weights (may be slow)
q1: the first quartile of all weights (may be slow)
q3: the third quartile of all weights (may be slow)
min: the minimum weight
max: the maximum weight
stdev: the sample standard deviation of all weights
count: the number of points plotted (weight value is ignored, this is like Density mode)
hit: one if any point is plotted, blank otherwise (weight value is ignored, this is like Flat mode)
Exporting: When exported to vector formats, the output is automatically forced to a bitmap for Density-mode layers. In the case of PostScript, this completely obscures any previous layers.