[sage-support] Re: paths in graphs
On Mon, Apr 27, 2009 at 12:06 PM, Jason Grout
wrote:
>
> William Stein wrote:
>> On Mon, Apr 27, 2009 at 10:02 AM, Jason Grout
>> wrote:
>>> William Stein wrote:
On Mon, Apr 27, 2009 at 7:45 AM, Robert Miller wrote:
> On Mon, Apr 27, 2009 at 6:47 AM, William Stein wrote:
>> Hi Robert,
>>
>> Did you guys every write any code to plot *paths* in graphs?
> No, but you can color the edges of the path differently.
That is pretty bad, IMHO. E.g., try this:
g = graphs.CompleteGraph(5)
g.plot(edge_colors={'red':[(0,1)]})
If you try to color any edges, then it *deletes* all other edges that
aren't colored.
>>> Well, "deletes" is a pretty strong word. More accurately, it doesn't
>>> show any edges for which you didn't specify a color.
>>>
>>> I've found this to be a slight annoyance when I wanted to create pretty
>>> edge-colored graphs, as I have to specifically color my "other" edges black.
>>>
>>
>> So do you also consider it a bug? I don't want to report bugs about
>> graph theory until getting some graph theorists to agree, since I'm
>> not a graph theorist.
>
> I don't know that it is a "bug" (i.e., an unintended consequence or
> mistake), but it is an interface decision that I think is annoying and
> surprising. For that reason, I'd be +1 on changing it.
>
> I think vertex_colors also has the same convention of hiding vertices
> that are not specified.
It's even worse. It leaves in the vertex label but forgets to draw
the circle around it. Ouch.
> You might also be interested in the "highlight" function from the bottom
> of #2378, which is a first step towards implementing functionality like
> the mathematica Highlight and AnimateGraph commands:
>
> http://reference.wolfram.com/mathematica/Combinatorica/ref/Highlight.html
>
> http://reference.wolfram.com/mathematica/Combinatorica/ref/AnimateGraph.html
>
> Jason
>
>
> >
>
--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org
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[sage-support] Re: paths in graphs
William Stein wrote:
> On Mon, Apr 27, 2009 at 10:02 AM, Jason Grout
> wrote:
>> William Stein wrote:
>>> On Mon, Apr 27, 2009 at 7:45 AM, Robert Miller wrote:
On Mon, Apr 27, 2009 at 6:47 AM, William Stein wrote:
> Hi Robert,
>
> Did you guys every write any code to plot *paths* in graphs?
No, but you can color the edges of the path differently.
>>> That is pretty bad, IMHO. E.g., try this:
>>>
>>> g = graphs.CompleteGraph(5)
>>> g.plot(edge_colors={'red':[(0,1)]})
>>>
>>> If you try to color any edges, then it *deletes* all other edges that
>>> aren't colored.
>>>
>> Well, "deletes" is a pretty strong word. More accurately, it doesn't
>> show any edges for which you didn't specify a color.
>>
>> I've found this to be a slight annoyance when I wanted to create pretty
>> edge-colored graphs, as I have to specifically color my "other" edges black.
>>
>
> So do you also consider it a bug? I don't want to report bugs about
> graph theory until getting some graph theorists to agree, since I'm
> not a graph theorist.
I don't know that it is a "bug" (i.e., an unintended consequence or
mistake), but it is an interface decision that I think is annoying and
surprising. For that reason, I'd be +1 on changing it.
I think vertex_colors also has the same convention of hiding vertices
that are not specified.
You might also be interested in the "highlight" function from the bottom
of #2378, which is a first step towards implementing functionality like
the mathematica Highlight and AnimateGraph commands:
http://reference.wolfram.com/mathematica/Combinatorica/ref/Highlight.html
http://reference.wolfram.com/mathematica/Combinatorica/ref/AnimateGraph.html
Jason
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[sage-support] Re: paths in graphs
On Mon, Apr 27, 2009 at 10:02 AM, Jason Grout
wrote:
>
> William Stein wrote:
>> On Mon, Apr 27, 2009 at 7:45 AM, Robert Miller wrote:
>>> On Mon, Apr 27, 2009 at 6:47 AM, William Stein wrote:
Hi Robert,
Did you guys every write any code to plot *paths* in graphs?
>>> No, but you can color the edges of the path differently.
>>
>> That is pretty bad, IMHO. E.g., try this:
>>
>> g = graphs.CompleteGraph(5)
>> g.plot(edge_colors={'red':[(0,1)]})
>>
>> If you try to color any edges, then it *deletes* all other edges that
>> aren't colored.
>>
>
> Well, "deletes" is a pretty strong word. More accurately, it doesn't
> show any edges for which you didn't specify a color.
>
> I've found this to be a slight annoyance when I wanted to create pretty
> edge-colored graphs, as I have to specifically color my "other" edges black.
>
So do you also consider it a bug? I don't want to report bugs about
graph theory until getting some graph theorists to agree, since I'm
not a graph theorist.
William
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[sage-support] Re: paths in graphs
William Stein wrote:
> On Mon, Apr 27, 2009 at 7:45 AM, Robert Miller wrote:
>> On Mon, Apr 27, 2009 at 6:47 AM, William Stein wrote:
>>> Hi Robert,
>>>
>>> Did you guys every write any code to plot *paths* in graphs?
>> No, but you can color the edges of the path differently.
>
> That is pretty bad, IMHO. E.g., try this:
>
> g = graphs.CompleteGraph(5)
> g.plot(edge_colors={'red':[(0,1)]})
>
> If you try to color any edges, then it *deletes* all other edges that
> aren't colored.
>
Well, "deletes" is a pretty strong word. More accurately, it doesn't
show any edges for which you didn't specify a color.
I've found this to be a slight annoyance when I wanted to create pretty
edge-colored graphs, as I have to specifically color my "other" edges black.
Jason
--~--~-~--~~~---~--~~
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[sage-support] Re: paths in graphs
On Mon, Apr 27, 2009 at 7:45 AM, Robert Miller wrote:
> On Mon, Apr 27, 2009 at 6:47 AM, William Stein wrote:
>> Hi Robert,
>>
>> Did you guys every write any code to plot *paths* in graphs?
>
> No, but you can color the edges of the path differently.
That is pretty bad, IMHO. E.g., try this:
g = graphs.CompleteGraph(5)
g.plot(edge_colors={'red':[(0,1)]})
If you try to color any edges, then it *deletes* all other edges that
aren't colored.
William
--~--~-~--~~~---~--~~
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