# How is the size value used to generate symbols?

I'd like to plot values where the area of a marker is proportional to
some value. How is the size value given in, say:

scatter(x,y,'o',s=10)

used to generate the markers? By eye it looks like the size value is
proportional to the area (i.e. proportional to the radius squared for
circle markers), but it would be nice to know for sure.

Thanks,
Neil

Neil Crighton wrote:

I'd like to plot values where the area of a marker is proportional to
some value. How is the size value given in, say:

scatter(x,y,'o',s=10)

used to generate the markers? By eye it looks like the size value is
proportional to the area (i.e. proportional to the radius squared for
circle markers), but it would be nice to know for sure.

Hi Neil,

good eyes Have a look at the scatter documentation:

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

Manuel

···

Thanks,
Neil

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Thanks! I also found the description under the class
RegularPolyCollection in collections.py:

* sizes gives the area of the circle circumscribing the regular
polygon in points^2

Neil

Manuel wrote:

···

Hi Neil,

good eyes Have a look at the scatter documentation:

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

Manuel

Neil Crighton wrote:

I'd like to plot values where the area of a marker is proportional to
some value. How is the size value given in, say:

scatter(x,y,'o',s=10)

used to generate the markers? By eye it looks like the size value is
proportional to the area (i.e. proportional to the radius squared for
circle markers), but it would be nice to know for sure.