[matplotlib] gscatter

I don't think something like that work in matplotlib with scatter for the marker parameter. But it's possible to use an array of sizes and colors, ie.

   s = [20,30,40]
   x = arange(3)
   y = arange(3)


See scatter doc string:

Arguments s and c can also be given as kwargs; this is encouraged
         for readability.

             s is a size in points^2. It is a scalar
               or an array of the same length as x and y.

             c is a color and can be a single color format string,
               or a sequence of color specifications of length N,
               or a sequence of N numbers to be mapped to colors
               using the cmap and norm specified via kwargs (see below).
               Note that c should not be a single numeric RGB or RGBA
               sequence because that is indistinguishable from an array
               of values to be colormapped. c can be a 2-D array in which
               the rows are RGB or RGBA, however.



Giorgio.Luciano@...507... wrote:

matalb has a gscatter command that work like this"

GSCATTER(X,Y,G) creates a scatter plot of the vectors X and Y
    grouped by G. Points with the same value of G are shown with
    the same color and marker. G is a grouping variable defined as
    a vector, a cell array of strings, or a string matrix, and it
    must have the same number of rows as X and Y. Alternatively
    G can be a cell array of grouping variables (such as {G1 G2 G3})
    to group the values in X by each unique combination of grouping
    variable values.
     GSCATTER(X,Y,G,CLR,SYM,SIZ) specifies the colors, markers, and
    size to use. CLR is either a string of color specifications or
    a three-column matrix of color specifications. SYM is a string
    of marker specifications. Type "help plot" for more information.
    For example, if SYM='o+x', the first group will be plotted with a
    circle, the second with plus, and the third with x. SIZ is a
    marker size to use for all plots. By default, the marker is '.'.
     GSCATTER(X,Y,G,CLR,SYM,SIZ,DOLEG) lets you control whether legends
    are created. Set DOLEG to 'on' (default) or 'off'.
    YNAM as the names of the X and Y variables. Each must be a
    character string. If you omit XNAM and YNAM, GSCATTER attempts to
    determine the names of the variables passed in as the first and
    second arguments.
     H = GSCATTER(...) returns an array of handles to the objects
     Example: Scatter plot of car data coded by country.
       load carsmall
       gscatter(Weight, MPG, Origin)
     See also grpstats, grp2idx."

it's very very useful instead of doing multiple scatter and merging them togheter. I think it can be easily implemented but i don't know how much request there is for it.