matplotlib-users

[Matplotlib-users] setting the default line style order

[Brian B. <bb...@br...>]

Hello,

I poked around a bit, and couldn't find the answer to this.  Is there a way to 
specify the default order of line colors and styles, for plot commands given in 
sequence, like:

plot(x1,y1)
plot(x2,y2)
plot(x3,y3)



	thanks,


			Brian Blais

-- 
-----------------

              bb...@br...
              http://web.bryant.edu/~bblais

Re: [Matplotlib-users] setting the default line style order

[<jk...@ik...>]

Brian Blais <bb...@br...> writes:

> Is there a way to specify the default order of line colors and
> styles, for plot commands given in sequence

I don't think there is built-in support for this. See e.g.
http://thread.gmane.org/gmane.comp.python.matplotlib.general/5708
for some previous discussion and suggestions.

-- 
Jouni K. Seppänen
http://www.iki.fi/jks

Re: [Matplotlib-users] setting the default line style order

[Fernando P. <fpe...@gm...>]

On 2/23/07, Jouni K. Sepp=E4nen <jk...@ik...> wrote:
> Brian Blais <bb...@br...> writes:
>
> > Is there a way to specify the default order of line colors and
> > styles, for plot commands given in sequence
>
> I don't think there is built-in support for this. See e.g.
> http://thread.gmane.org/gmane.comp.python.matplotlib.general/5708
> for some previous discussion and suggestions.

It's probably worth mentioning that the cyclers John mentions are
trivial to write using itertools:

colorcycler =3D itertools.cycle(['blue','green','red','magenta','cyan'])
linecycler =3D itertools.cycle([ '-','--', '-.' , ':' ])
n =3D itertools.count()
y =3D array([1,2,3])

Then, try:

for i in range(10):
plot(y+n.next(),color=3Dc.next(),linestyle=3Dlinecycler.next())
plot(y+n.next(),color=3Dc.next(),linestyle=3Dlinecycler.next())
plot(y+n.next(),color=3Dc.next(),linestyle=3Dlinecycler.next())
plot(y+n.next(),color=3Dc.next(),linestyle=3Dlinecycler.next())
plot(y+n.next(),color=3Dc.next(),linestyle=3Dlinecycler.next())
plot(y+n.next(),color=3Dc.next(),linestyle=3Dlinecycler.next())
plot(y+n.next(),color=3Dc.next(),linestyle=3Dlinecycler.next())
plot(y+n.next(),color=3Dc.next(),linestyle=3Dlinecycler.next())

Re: [Matplotlib-users] setting the default line style order

[Fernando P. <fpe...@gm...>]

On 2/23/07, Fernando Perez <fpe...@gm...> wrote:
> On 2/23/07, Jouni K. Sepp=E4nen <jk...@ik...> wrote:
> > Brian Blais <bb...@br...> writes:
> >
> > > Is there a way to specify the default order of line colors and
> > > styles, for plot commands given in sequence
> >
> > I don't think there is built-in support for this. See e.g.
> > http://thread.gmane.org/gmane.comp.python.matplotlib.general/5708
> > for some previous discussion and suggestions.
>
> It's probably worth mentioning that the cyclers John mentions are
> trivial to write using itertools:

Sorry, tab put me in the 'send' button in gmail too early... I meant:

import itertools

colorcycler =3D itertools.cycle(['blue','green','red','magenta','cyan']).ne=
xt
linecycler =3D itertools.cycle([ '-','--', '-.' , ':' ]).next
n =3D itertools.count().next

y =3D array([1,2,3])

for i in range(10):
    plot(y+n(),color=3Dcolorcycler(),linestyle=3Dlinecycler())



Cheers,

f

Re: [Matplotlib-users] setting the default line style order

[<jk...@ik...>]

The question of setting the color and line style sequences comes up
every now and then, and although there are neat solutions like
Fernando demonstrated, perhaps we should add support for them to
matplotlib. The Matlab interface seems to be like this:

>> figure                                                                         
>> set(gca, 'LineStyleOrder', '-o|-x|-^') % sequence of three line styles         
>> set(gca, 'ColorOrder', [1 0 0; 0 0 1]) % sequence of two colors (red and blue)
>> set(gca, 'NextPlot', 'replacechildren') % don't reset the properties I just set
>> plot(random(6))

This plots six lines with different combinations of style and color;
the seventh line would look the same as the first. Probably you can
avoid the NextPlot thing by setting DefaultLineStyleOrder on the root
handle, but never mind.

So, to make the interface familiar to Matlab users, I suggest to add
properties line.linestyleorder and line.colororder that can take any
sequences of linestyles and colors, or an n-by-3 array of rgb color
values for the latter. I think the |-separated linestyles spec is a
hack (necessary in Matlab because it cannot have vectors of strings
because of the auto-flattening matrices) that we shouldn't emulate.
How does that sound?

-- 
Jouni K. Seppänen
http://www.iki.fi/jks

Re: [Matplotlib-users] setting the default line style order

[Eric F. <ef...@ha...>]

Jouni K. Seppänen wrote:
> The question of setting the color and line style sequences comes up
> every now and then, and although there are neat solutions like
> Fernando demonstrated, perhaps we should add support for them to
> matplotlib. The Matlab interface seems to be like this:
> 
>>> figure                                                                         
>>> set(gca, 'LineStyleOrder', '-o|-x|-^') % sequence of three line styles         
>>> set(gca, 'ColorOrder', [1 0 0; 0 0 1]) % sequence of two colors (red and blue)
>>> set(gca, 'NextPlot', 'replacechildren') % don't reset the properties I just set
>>> plot(random(6))
> 
> This plots six lines with different combinations of style and color;
> the seventh line would look the same as the first. Probably you can
> avoid the NextPlot thing by setting DefaultLineStyleOrder on the root
> handle, but never mind.
> 
> So, to make the interface familiar to Matlab users, I suggest to add
> properties line.linestyleorder and line.colororder that can take any
> sequences of linestyles and colors, or an n-by-3 array of rgb color
> values for the latter. I think the |-separated linestyles spec is a
> hack (necessary in Matlab because it cannot have vectors of strings
> because of the auto-flattening matrices) that we shouldn't emulate.
> How does that sound?
> 

Are you talking about Axes properties (instance attributes) or rcParam 
entries or both?  In any case, I agree that built-in support would easy 
to provide and would help enough people to be worthwhile.

Eric

Re: [Matplotlib-users] setting the default line style order

[<jk...@ik...>]

Eric Firing <ef...@ha...> writes:

> Jouni K. Seppänen wrote:
>> So, to make the interface familiar to Matlab users, I suggest to add
>> properties line.linestyleorder and line.colororder 
>
> Are you talking about Axes properties (instance attributes) or rcParam 
> entries or both?  In any case, I agree that built-in support would easy 
> to provide and would help enough people to be worthwhile.

I was thinking about rcParam entries, but now that you mention it,
Axes properties would make more sense.

-- 
Jouni K. Seppänen
http://www.iki.fi/jks