Re: [Matplotlib-users] plotting a colored symbol with plot command

[Damon M. <dam...@gm...>]

Hey Michael!

Welcome :)

On Fri, Aug 24, 2012 at 01:00:13PM -0700, Michael Rawlins wrote:
> 
> Relatively new user here. I need to place a series of white colored dots on a map. I've been able to place black dots using:
> 
> plt.plot(x,y,color='k',marker='.',markersize=3.0)
>

You can change the colour with:

plt.pyplot(x, y, color='g', marker='.', markersize=3.0)

That will plot a green dot.

> 
> The color option in this command does not plot the chosen color, only black. The command:
> 
> plt.plot(x,y,'wo')
>

You can change the colour of the edge with the 'markeredgecolour'
option, or 'mec' for short:

plt.plot(x, y, 'wo', mec='w')

Kablam! Big white Os with no black edge.
You can also control the size of the marker there, too:

plt.plot(x, y, 'wo', mec='w', markersize=10.0)

> 
> places white dots with black around the edges.  I see that the 'w' is for white and 'o' is for the symbol. I'd like to use the former command since that gives me control over marker size and a dot without a black edge.
> 
> Lastly, it's not clear to me if I should be using plt.plot or just plot. Both work, and I don't know the difference. 

If you're using pylab, it doesn't matter:

In [5]: print plot
<function plot at 0x10cddbd70>

In [6]: print plt.plot
<function plot at 0x10cddbd70>

They are *literally* the same function in memory.

Hope this helps, Michael.
Good luck!

-- 
Damon McDougall
http://www.damon-is-a-geek.com
B2.39
Mathematics Institute
University of Warwick
Coventry
West Midlands
CV4 7AL
United Kingdom