[EMAIL PROTECTED] 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'.
>
> GSCATTER(X,Y,G,CLR,SYM,SIZ,DOLEG,XNAM,YNAM) specifies XNAM and
> 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
> created.
>
> 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.
>
>
> Giorgio
>
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)
scatter(x,y,s=s)
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.
Manuel
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