Using grouping variables

using InMemoryDatasets, StatisticalGraphics, DLMReader

Scatter like many other plot types accepts a group keyword argument to group observations and creat a separate plot for each group. The groups are distinguishable by color.

iris = filereader(joinpath(dirname(pathof(StatisticalGraphics)),
                                 "..", "docs", "assets", "iris.csv"))
sgplot(iris, Scatter(x=:PetalLength, y=:SepalLength,
                                     group=:Species, thickness=3),
                                     wallcolor=:lightgray,
                                     clip=false)

More examples,

# generate random data
ds = Dataset(x=rand(100), y=rand(100), g=rand(1:4, 100))

sgplot(ds, Scatter(x=:x, y=:y, size=200, group=:g,
                         color=:white, clip=false))

In the previous example column :g was used to group observations. Since :g is a numeric column, sgplot automatically assigns a continous color bar in the legend of the plot, however, user can pass a list of nominal columns to sgplot to override the default behaviour.

sgplot(ds, Scatter(x=:x, y=:y, size=200, group=:g,
                         color=:white, clip=false), nominal=:g)

Scatter allows user to pass a column to control the fill color of points, i.e. the fill color of the points will be affected by the value of the passed column to the colorresponse keyword argument

sgplot(ds, Scatter(x=:x, y=:y, size=200, colorresponse=:g,
                         color=:white, clip=false), nominal=:g)

Additionally, Scatter allows users to pass extra columns as symbolresponse, angleresponse, or opacityresponse. In this case the corresponding property will be changed depending on the values of the passed column.

sgplot(ds, Scatter(x=:x, y=:y, size=200, symbolresponse=:g,
                         clip=false), nominal=:g)

The same column can be used for multiple purposes:

sgplot(ds, Scatter(x=:x, y=:y, size=200, group=:g,
                         symbolresponse=:g, clip=false), nominal=:g)

colormodel allows users to pass a customised color scheme (or a vector of colors) for colorresponse

sgplot(ds, Scatter(x=:x, y=:y, size=200, group=:g,
                         thickness=2,
                         symbolresponse=:g,
                         colorresponse=:g,
                         colormodel=Dict(:scheme=>:turbo),
                         clip=false), nominal=:g)

This page was generated using DemoCards.jl and Literate.jl.