[Tutor] optimize a plot

[lina]

On Wed, Nov 16, 2011 at 1:51 AM, Alan Gauld <alan.gauld at btinternet.com> wrote:
> On 15/11/11 14:34, lina wrote:
>>
>> Sorry for some not mature questions asked before, fixed now by:
>>
>> def PlotPathway(list1):
>>
>>     for i in range(len(list1)):
>>            for j in range(len(list1[i])-1):
>>                    if list1[i][j] != list1[i][j+1]:
>>                        if ((int(list1[i][j]))<  43 and
>> (int(list1[i][j-1]))<  43):
>>                            g.add_edge(list1[i][j], list1[i][j+1])
>>     for i in range(43,84):
>>         if g.has_node(i):
>>                    g.delete_node(i)
>>     g.draw('graph4.png', prog="dot")
>>
>>
>> just still don't get why the "if" does not work as expected.
>
>
> Sorry, I haven't been following you earlier thread.
My mistake, I attached a figure in earlier posting,
but the message was held for approval due to it's too big.
I just noticed those three notifications, so I canceled posting, not
sure waiting for approval will get approved or not.
> Which 'if'? There are 3 to choose from.
> And how did you expect it to behave, and what is it doing that you didn't
> expect?

During those process, I met lots of problems, some are fixed, and some
are forgot or switch to another problem.

One thing is that I did not know how to get node value,
and for the node value to change the attirbute of this certain node.

This way is wrong:


def PlotPathway(list1):
    for i in range(len(list1)):
        for j in range(len(list1[i])-1):
		    if list1[i][j] != list1[i][j+1]:
		        g.add_edge(list1[i][j], list1[i][j+1])

                if list1[i][j]<=42:
                    g.node_attr.update(color='deepskyblue',style='filled')
                if list1[i][j] > 42:
                    g.node_attr.update(color='green',style='filled')

it will keep on updating and mess things up, but this way can get the value.

Below is a better way:


def colorNodes(listofnodes):
    node_list=[]
    node_list_A=[]
    node_list_B=[]
    for node in g:
        node_list.append(node)
        if node.value < 42: ### I don't know how to get the value of the node.
            g.node_attr.update(color='deepskyblue',style='filled')
        else:
            g.node_attr.update(color='green',style='filled')

>
> --
> Alan G
> Author of the  Learn to Program web site
> http://www.alan-g.me.uk/
>
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