On Thu, Feb 2, 2012 at 2:54 PM, Jim St.Cyr <jim.st...@gmail.com> wrote:
> On 2/2/2012 3:41 PM, Benjamin Root wrote:
>
> On Wed, Feb 1, 2012 at 4:07 PM, Jim St.Cyr <jim.st...@gmail.com> wrote:
>
>> Hello-
>>
>> Scenario:
>>
>> Basemap used to display the East Coast of the US and the Atlantic Ocean.
>> Shapelib is used read a shapefile the contents of is pumped into a PyPlot
>> subplot hosted Line Collection which overlays the ocean with a grid
>> PyPlot text is used to label each grid with it's designator.
>>
>> What I want to do is plot a collection of points, save the result as a
>> PNG,
>> clear the first set of points, plot another collection of points, save the
>> result, and so on. The problem is the if I use the Pyplot clf function
>> it wipes
>> everything previously built.
>>
>> What do I need to do in order to clear just the points without clearing
>> everything?
>>
>> Thank you.
>>
>> Jim
>>
>>
> Jim,
>
> Sorry for the delay. Most plotting functions in matplotlib returns a
> Collection object. These objects have a member function "remove()".
>
> >>> import matplotlib.pyplot as plt
> >>> plt.ion()
> >>> plt.plot([0, 1, 2, 3, 4], [4, 3, 2, 1, 0])
> >>> pts = plt.scatter([1, 2, 3], [1, 2, 3])
> >>> plt.show() # You see three points and a line
> >>> res.remove()
> >>> plt.show() # Now you see only the line
>
>
> I hope that helps!
> Ben Root
>
> Ben-
>
> Very helpful. A question, how do you determine the object designator? In
> your example above, res.remove(), where did the 'res' come from?
>
> Jim
>
It was assigned when I called scatter(). Just about any mpl plotting
function (plot(), scatter(), hist(), etc.) returns an object. Most of the
time, users do not save the result into a variable, but if you want to do
advanced tricks, you will need to save those returns.
Ben Root
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