[sage-support] Re: new cell in worksheet
William Stein wrote:
On Mon, Mar 23, 2009 at 11:07 AM, Jose Guzman n...@neurohost.org wrote:
Stan Schymanski wrote:
In this context, I'm having trouble inserting a calculation cell before
a html cell or between two html cells in Sage 3.4. The Alt-Enter or
Ctrl-Enter methods don't not work in html cells. If I want to insert a
calculation cell before an html cell, I can't just press Alt-Enter in
the foregoing calculation cell, because this creates a new calculation
cell AFTER the html cell. Is there another way?
Cheers,
Stan
kcrisman wrote:
Dear Kwankyu,
If I write and evaluate in a cell in a worksheet and if there are
already cells below the one which I am evaluating, then the cursor
moves into the cell just below instead of creating a new cell for next
input. Is this behavior preferable? This is annoying at least to me.
One of the designers can answer for the technical reasons for this
design decision, but let me tell you it is very useful when you are
running through a worksheet you have already created, but changing a
few things (e.g. some initial constant defined at the top)!
But actually, if you click on Help you will see that Alt-Enter
actually does what you require, while Ctrl-Enter splits the cell and
evaluates both things. I didn't know either of these until I looked
just now, and will definitely use them now too.
Enjoy!
- kcrisman
I found this problem very annoying too. This is a purely pragmatic
solution, but what I do is to go to the edit button and change the
source code to add a new cell just typing {{{id=X \\\}}} where X is an
integer not present in my worksheet.
Hope it helps
You should be able to put a new cell in just by typing
{{{
}}}
Note that (1) the id=X thing isn't needed at all, and (2) it's three
*forward* slashes, not three backward slashes like it says above, but
those aren't needed either.
William
Thank you very much for your information Willian. As I mentioned, these
are trial and error tricks, I was not awared that the solution was so easy.
Thanks!
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[sage-support] Re: new cell in worksheet
Hi Jason, Thanks a lot for that! Your proposal sounds good. Pity it hasn't been implemented yet, but perhaps the tickets you submitted will help. I'll contribute my thoughts when I have an account. Stan On Mar 23, 4:01 pm, Jason Grout jason-s...@creativetrax.com wrote: Stan Schymanski wrote: Thanks for your feedback, Jason! Could you submit a ticket for this to be fixed/enhanced? Unfortunately, I can't do it myself. We should get you a trac account, then. You can follow the instructions onhttp://trac.sagemath.org/sage_trac/ The bugs are nowhttp://trac.sagemath.org/sage_trac/ticket/5591 and The bug is nowhttp://trac.sagemath.org/sage_trac/ticket/5592 As for the alt-enter and ctrl-enter thing, can you look at my proposal in the last few messages in this thread:http://groups.google.com/group/sage-devel/browse_thread/thread/5892dd... (specifically,http://groups.google.com/group/sage-devel/msg/e351edd7b62437b9) That proposal deals with splitting cells. Note that two adjacent text cells are merged whenever the sheet is saved and reopened. I don't know that alt-enter and ctrl-enter makes sense right now (however, maybe the text cells shouldn't be merged, and maybe alt-enter and ctrl-enter should make sense...) Jasno Cheers, Stan Jason Grout wrote: Stan Schymanski wrote: In this context, I'm having trouble inserting a calculationcellbefore a htmlcellor between two html cells in Sage 3.4. The Alt-Enter or Ctrl-Enter methods don't not work in html cells. Both of these are because they have not been implemented. Contributions are definitely welcome! If I want to insert a calculationcellbefore an htmlcell, I can't just press Alt-Enter in the foregoing calculationcell, because this creates anewcalculation cellAFTER the htmlcell. Is there another way? Hmmm...I'd consider this a bug. The Alt-enter should make anew calculationcellright after the old calculationcell(before the following htmlcell). Jason Cheers, Stan kcrisman wrote: Dear Kwankyu, If I write and evaluate in acellin aworksheetand if there are already cells below the one which I am evaluating, then the cursor moves into thecelljust below instead of creating anewcellfor next input. Is this behavior preferable? This is annoying at least to me. One of the designers can answer for the technical reasons for this design decision, but let me tell you it is very useful when you are running through aworksheetyou have already created, but changing a few things (e.g. some initial constant defined at the top)! But actually, if you click on Help you will see that Alt-Enter actually does what you require, while Ctrl-Enter splits thecelland evaluates both things. I didn't know either of these until I looked just now, and will definitely use them now too. Enjoy! - kcrisman --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: maximum recursion depht exceded
Thank you for your help, i will test that. --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Problem plotting a function with plot()
The following displays a plot in my notebook (Sage3.4) if I put it all
in the same cell:
sage: var('t'); # symbolic variable
sage: var('g'); # symbolic variable
sage: f(t) = g*(t**2-1)/(2*(t-1)) # try to simplify this function later...
sage: plot(f.subs(g=9.81), 0, 10)
Does this not work for you?
Stan
Jose Guzman wrote:
By the way, if you type
sage: plot(f.subs(g=9.81), 0, 10)
then the plot will be displayed -- you don't need to save the plot and
then 'show' it.
I tried this and it works only with the console. If you use the notebook
you have to use the show() command. Anyway, thank you very much for the
tip!!1
Jose.
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[sage-support] Re: Magma Problem
My operating system is Linux Ubuntu 8.04 on a computer with Dual CORE Intel(R). if you start sage and do sage: !magma then output is sh: magma: not found On Sat, Mar 21, 2009 at 2:11 AM, William Stein wst...@gmail.com wrote: On Fri, Mar 20, 2009 at 7:48 AM, Santanu Sarkar sarkar.santanu@gmail.com wrote: I have installed both Magma and Sage. How can I use Magma in the Sage notebook (with Mozilla Firefox)? I always get RuntimeError: Unable to start magma because the command 'magma -n' failed. Probably Sage does not know where to find my magma installation. How can I specify it? Precisely what operating system are you using? What happens if you start sage and do sage: !magma William --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Problem plotting a function with plot()
Stan Schymanski wrote:
The following displays a plot in my notebook (Sage3.4) if I put it all
in the same cell:
sage: var('t'); # symbolic variable
sage: var('g'); # symbolic variable
sage: f(t) = g*(t**2-1)/(2*(t-1)) # try to simplify this function later...
sage: plot(f.subs(g=9.81), 0, 10)
Does this not work for you?
Stan
Jose Guzman wrote:
By the way, if you type
sage: plot(f.subs(g=9.81), 0, 10)
then the plot will be displayed -- you don't need to save the plot and
then 'show' it.
I tried this and it works only with the console. If you use the notebook
you have to use the show() command. Anyway, thank you very much for the
tip!!1
Jose.
Yes it works! for some strange reason it did not work in my old sheet. I
though to plot one should use a combination of plot() and show()
commands. Actually, I created a small tutorial for private use to learn
more about sage commands to plot, which talks about the use of plot()
and show(). I expected to use it for my future curse of Sage for
scientist in my institute. :P You can see in http://sagenb.org/home/pub/399
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[sage-support] Re: Problem plotting a function with plot()
Jose Guzman wrote: Yes it works! for some strange reason it did not work in my old sheet. I though to plot one should use a combination of plot() and show() commands. Actually, I created a small tutorial for private use to learn more about sage commands to plot, which talks about the use of plot() and show(). I expected to use it for my future curse of Sage for scientist in my institute. :P You can see in http://sagenb.org/home/pub/399 This looks great. Would you be willing to contribute it to Sage as a primer? (A Sage primer is a short, focused exploration of a specific functionality of Sage.) Jason --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Problem plotting a function with plot()
Jose Guzman wrote: Yes it works! for some strange reason it did not work in my old sheet. I though to plot one should use a combination of plot() and show() commands. Actually, I created a small tutorial for private use to learn more about sage commands to plot, which talks about the use of plot() and show(). I expected to use it for my future curse of Sage for scientist in my institute. :P You can see in http://sagenb.org/home/pub/399 In looking at your code, I had an idea about specifying colors. Why don't we have some default color objects defined in Sage, like red, blue, yellow, green, etc. Methods could include .darker(), .lighter(), etc. So you could specify a plot as: plot(x^2, (x,0,1), color=red) plot(x^3, (x,0,1), color=blue.darker()) plot(x^4, (x,0,1), color=green.lighter()) plot(x^5, (x,0,1), color=red+blue) #gives purple :) and then for the more esoteric names (all of the standard web colors, all of the standard x11 colors, etc.), use the color namespace. plot(sin(x), (x,0,1), color=color.goldenrod) Thoughts? Jason --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Problem plotting a function with plot()
Jason Grout wrote: Jose Guzman wrote: Yes it works! for some strange reason it did not work in my old sheet. I though to plot one should use a combination of plot() and show() commands. Actually, I created a small tutorial for private use to learn more about sage commands to plot, which talks about the use of plot() and show(). I expected to use it for my future curse of Sage for scientist in my institute. :P You can see in http://sagenb.org/home/pub/399 This looks great. Would you be willing to contribute it to Sage as a primer? (A Sage primer is a short, focused exploration of a specific functionality of Sage.) Jason Dear Jason, I would be happy to contribute to any form with the development/expansion of Sage :D. Feel free to use this document. However, somebody would have to check it just before publishing. The document is only a very short introduction, I was planning to add some other features (ie. plot_list() ) and the 3D plotting capabilities of Sage. You may want to have a look to the other worksheet I published online about limit calculations, just enter: http://sagenb.org/home/pub/398/ As I commented before, I am planning to do a series of basic documentation of that type related with Sage for scientific purposes. Feel free to contact me any time. Jose. --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Problem plotting a function with plot()
In looking at your code, I had an idea about specifying colors. Why don't we have some default color objects defined in Sage, like red, blue, yellow, green, etc. Methods could include .darker(), .lighter(), etc. So you could specify a plot as: plot(x^2, (x,0,1), color=red) plot(x^3, (x,0,1), color=blue.darker()) plot(x^4, (x,0,1), color=green.lighter()) plot(x^5, (x,0,1), color=red+blue) #gives purple :) and then for the more esoteric names (all of the standard web colors, all of the standard x11 colors, etc.), use the color namespace. plot(sin(x), (x,0,1), color=color.goldenrod) This sounds great; presumably it wouldn't be too hard to do, if very annoying (particularly because some of the plot methods only allow rgbcolor, others allow cmap options, etc.) - though what if I want red to stand for some other Python/Sage object? And of course only English colors would be there, and what about gray/grey ... By the way, other readers of this thread please note: sage: plot(x^2, (x,0,1), color='red') works fine! - kcrisman --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Problem plotting a function with plot()
kcrisman wrote: In looking at your code, I had an idea about specifying colors. Why don't we have some default color objects defined in Sage, like red, blue, yellow, green, etc. Methods could include .darker(), .lighter(), etc. So you could specify a plot as: plot(x^2, (x,0,1), color=red) plot(x^3, (x,0,1), color=blue.darker()) plot(x^4, (x,0,1), color=green.lighter()) plot(x^5, (x,0,1), color=red+blue) #gives purple :) and then for the more esoteric names (all of the standard web colors, all of the standard x11 colors, etc.), use the color namespace. plot(sin(x), (x,0,1), color=color.goldenrod) This sounds great; presumably it wouldn't be too hard to do, if very annoying (particularly because some of the plot methods only allow rgbcolor, others allow cmap options, etc.) - though what if I want red to stand for some other Python/Sage object? And of course only English colors would be there, and what about gray/grey ... By the way, other readers of this thread please note: sage: plot(x^2, (x,0,1), color='red') works fine! - kcrisman I particularly like the rgbcolor notation. That's the only way I found to have vector graphic environment (i.e inkscape) to match with matplotlib or sage . On the other hand I usually use some kind of ... plot (x**2, (0,1), rgbcolor=(0.5,0.5,0) ) # dark green because I found the default green color (rgbcolor=(0,1,0)) looks too brilliant with some beamers when you give a talk. Anyway, I tried with rgbcolor='blue' ,'red','green','yellow','black','orange' and worked fine. --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Problem plotting a function with plot()
Jose Guzman wrote: kcrisman wrote: In looking at your code, I had an idea about specifying colors. Why don't we have some default color objects defined in Sage, like red, blue, yellow, green, etc. Methods could include .darker(), .lighter(), etc. So you could specify a plot as: plot(x^2, (x,0,1), color=red) plot(x^3, (x,0,1), color=blue.darker()) plot(x^4, (x,0,1), color=green.lighter()) plot(x^5, (x,0,1), color=red+blue) #gives purple :) and then for the more esoteric names (all of the standard web colors, all of the standard x11 colors, etc.), use the color namespace. plot(sin(x), (x,0,1), color=color.goldenrod) This sounds great; presumably it wouldn't be too hard to do, if very annoying (particularly because some of the plot methods only allow rgbcolor, others allow cmap options, etc.) - though what if I want red to stand for some other Python/Sage object? And of course only English colors would be there, and what about gray/grey ... By the way, other readers of this thread please note: sage: plot(x^2, (x,0,1), color='red') works fine! - kcrisman I particularly like the rgbcolor notation. That's the only way I found to have vector graphic environment (i.e inkscape) to match with matplotlib or sage . On the other hand I usually use some kind of ... plot (x**2, (0,1), rgbcolor=(0.5,0.5,0) ) # dark green because I found the default green color (rgbcolor=(0,1,0)) looks too brilliant with some beamers when you give a talk. Anyway, I tried with rgbcolor='blue' ,'red','green','yellow','black','orange' and worked fine. Yes, I'm saying that in addition to being able to pass a tuple or string, we'd be able to pass a sage color object. Jason --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Problem plotting a function with plot()
On Tue, Mar 24, 2009 at 9:27 AM, Jason Grout
jason-s...@creativetrax.com wrote:
Jose Guzman wrote:
kcrisman wrote:
In looking at your code, I had an idea about specifying colors. Why
don't we have some default color objects defined in Sage, like red,
blue, yellow, green, etc. Methods could include .darker(), .lighter(),
etc. So you could specify a plot as:
plot(x^2, (x,0,1), color=red)
plot(x^3, (x,0,1), color=blue.darker())
plot(x^4, (x,0,1), color=green.lighter())
plot(x^5, (x,0,1), color=red+blue) #gives purple :)
and then for the more esoteric names (all of the standard web colors,
all of the standard x11 colors, etc.), use the color namespace.
plot(sin(x), (x,0,1), color=color.goldenrod)
This sounds great; presumably it wouldn't be too hard to do, if very
annoying (particularly because some of the plot methods only allow
rgbcolor, others allow cmap options, etc.) - though what if I want red
to stand for some other Python/Sage object? And of course only
English colors would be there, and what about gray/grey ...
By the way, other readers of this thread please note:
sage: plot(x^2, (x,0,1), color='red')
works fine!
- kcrisman
I particularly like the rgbcolor notation. That's the only way I found
to have vector graphic environment (i.e inkscape) to match with
matplotlib or sage . On the other hand I usually use some kind of ...
plot (x**2, (0,1), rgbcolor=(0.5,0.5,0) ) # dark green
because I found the default green color (rgbcolor=(0,1,0)) looks too
brilliant with some beamers when you give a talk. Anyway, I tried with
rgbcolor='blue' ,'red','green','yellow','black','orange' and worked fine.
Yes, I'm saying that in addition to being able to pass a tuple or
string, we'd be able to pass a sage color object.
That's a great idea, which is why I implemented it over a year ago :-)
sage: C = Color('red')# a Sage color object
sage: C
RGB color (1.0, 0.0, 0.0)
sage: C.html_color()
'#ff'
sage: plot(x^2, (x,0,1), color=C)
I think the only strings allowed in the Color constructor are:
red : (1.0,0.0,0.0),
orange: (1.0,.5,0.0),
yellow: (1.0,1.0,0.0),
green : (0.0,1.0,0.0),
blue : (0.0,0.0,1.0),
purple: (.5,0.0,1.0),
white : (1.0,1.0,1.0),
black : (0.0,0.0,0.0),
grey : (.5,.5,.5)
You can also use any html color strings.
To give the functionality you want, you could add methods lighter()
and darker() to the existing color object.
William
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[sage-support] Re: Problem plotting a function with plot()
William Stein wrote:
On Tue, Mar 24, 2009 at 9:27 AM, Jason Grout
jason-s...@creativetrax.com wrote:
Jose Guzman wrote:
kcrisman wrote:
In looking at your code, I had an idea about specifying colors. Why
don't we have some default color objects defined in Sage, like red,
blue, yellow, green, etc. Methods could include .darker(), .lighter(),
etc. So you could specify a plot as:
plot(x^2, (x,0,1), color=red)
plot(x^3, (x,0,1), color=blue.darker())
plot(x^4, (x,0,1), color=green.lighter())
plot(x^5, (x,0,1), color=red+blue) #gives purple :)
and then for the more esoteric names (all of the standard web colors,
all of the standard x11 colors, etc.), use the color namespace.
plot(sin(x), (x,0,1), color=color.goldenrod)
This sounds great; presumably it wouldn't be too hard to do, if very
annoying (particularly because some of the plot methods only allow
rgbcolor, others allow cmap options, etc.) - though what if I want red
to stand for some other Python/Sage object? And of course only
English colors would be there, and what about gray/grey ...
By the way, other readers of this thread please note:
sage: plot(x^2, (x,0,1), color='red')
works fine!
- kcrisman
I particularly like the rgbcolor notation. That's the only way I found
to have vector graphic environment (i.e inkscape) to match with
matplotlib or sage . On the other hand I usually use some kind of ...
plot (x**2, (0,1), rgbcolor=(0.5,0.5,0) ) # dark green
because I found the default green color (rgbcolor=(0,1,0)) looks too
brilliant with some beamers when you give a talk. Anyway, I tried with
rgbcolor='blue' ,'red','green','yellow','black','orange' and worked fine.
Yes, I'm saying that in addition to being able to pass a tuple or
string, we'd be able to pass a sage color object.
That's a great idea, which is why I implemented it over a year ago :-)
sage: C = Color('red')# a Sage color object
sage: C
RGB color (1.0, 0.0, 0.0)
sage: C.html_color()
'#ff'
sage: plot(x^2, (x,0,1), color=C)
I think the only strings allowed in the Color constructor are:
red : (1.0,0.0,0.0),
orange: (1.0,.5,0.0),
yellow: (1.0,1.0,0.0),
green : (0.0,1.0,0.0),
blue : (0.0,0.0,1.0),
purple: (.5,0.0,1.0),
white : (1.0,1.0,1.0),
black : (0.0,0.0,0.0),
grey : (.5,.5,.5)
You can also use any html color strings.
To give the functionality you want, you could add methods lighter()
and darker() to the existing color object.
So how about:
* predefining a bunch of colors in the global namespace (maybe just what
is available in the current strings?)
* predefining a huge number of colors, but sticking them in the colors
namespace
* making some nicely matched color sets (color schemes, if you will).
* make a generic mixing function (which takes the weighted average of
self and other, according to a specifiable fraction)
* make darker/lighter functions
* adding together colors averages them
* a linear combination takes a weighted average (hmmm...have to think
about how to do this one...maybe it'd make more sense to do a different
average?)
Here is what MMA does with colors:
http://reference.wolfram.com/mathematica/guide/Colors.html
Sounds like a great get-your-feet-wet student project...
Jason
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[sage-support] Re: Problem plotting a function with plot()
On Tue, Mar 24, 2009 at 11:03 AM, Jason Grout
jason-s...@creativetrax.com wrote:
William Stein wrote:
On Tue, Mar 24, 2009 at 9:27 AM, Jason Grout
jason-s...@creativetrax.com wrote:
Jose Guzman wrote:
kcrisman wrote:
In looking at your code, I had an idea about specifying colors. Why
don't we have some default color objects defined in Sage, like red,
blue, yellow, green, etc. Methods could include .darker(), .lighter(),
etc. So you could specify a plot as:
plot(x^2, (x,0,1), color=red)
plot(x^3, (x,0,1), color=blue.darker())
plot(x^4, (x,0,1), color=green.lighter())
plot(x^5, (x,0,1), color=red+blue) #gives purple :)
and then for the more esoteric names (all of the standard web colors,
all of the standard x11 colors, etc.), use the color namespace.
plot(sin(x), (x,0,1), color=color.goldenrod)
This sounds great; presumably it wouldn't be too hard to do, if very
annoying (particularly because some of the plot methods only allow
rgbcolor, others allow cmap options, etc.) - though what if I want red
to stand for some other Python/Sage object? And of course only
English colors would be there, and what about gray/grey ...
By the way, other readers of this thread please note:
sage: plot(x^2, (x,0,1), color='red')
works fine!
- kcrisman
I particularly like the rgbcolor notation. That's the only way I found
to have vector graphic environment (i.e inkscape) to match with
matplotlib or sage . On the other hand I usually use some kind of ...
plot (x**2, (0,1), rgbcolor=(0.5,0.5,0) ) # dark green
because I found the default green color (rgbcolor=(0,1,0)) looks too
brilliant with some beamers when you give a talk. Anyway, I tried with
rgbcolor='blue' ,'red','green','yellow','black','orange' and worked fine.
Yes, I'm saying that in addition to being able to pass a tuple or
string, we'd be able to pass a sage color object.
That's a great idea, which is why I implemented it over a year ago :-)
sage: C = Color('red') # a Sage color object
sage: C
RGB color (1.0, 0.0, 0.0)
sage: C.html_color()
'#ff'
sage: plot(x^2, (x,0,1), color=C)
I think the only strings allowed in the Color constructor are:
red : (1.0,0.0,0.0),
orange: (1.0,.5,0.0),
yellow: (1.0,1.0,0.0),
green : (0.0,1.0,0.0),
blue : (0.0,0.0,1.0),
purple: (.5,0.0,1.0),
white : (1.0,1.0,1.0),
black : (0.0,0.0,0.0),
grey : (.5,.5,.5)
You can also use any html color strings.
To give the functionality you want, you could add methods lighter()
and darker() to the existing color object.
So how about:
* predefining a bunch of colors in the global namespace (maybe just what
is available in the current strings?)
I would say -1, except Mathematica does that, and I'm for general
mathematica-style api compatibility. So I'm +1 on that.
* predefining a huge number of colors, but sticking them in the colors
namespace
I don't care...
* making some nicely matched color sets (color schemes, if you will).
* make a generic mixing function (which takes the weighted average of
self and other, according to a specifiable fraction)
That sounds useful.
* make darker/lighter functions
That couldn't hurt.
* adding together colors averages them
That makes sense.
* a linear combination takes a weighted average (hmmm...have to think
about how to do this one...maybe it'd make more sense to do a different
average?)
Well if you do A + B + C, then Python will do A+B then (A+B)+C, so
the previous point determines this one.
Here is what MMA does with colors:
http://reference.wolfram.com/mathematica/guide/Colors.html
Sounds like a great get-your-feet-wet student project...
Jason
--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org
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[sage-support] Re: Problem plotting a function with plot()
On Mar 24, 2009, at 11:03 AM, Jason Grout wrote:
William Stein wrote:
On Tue, Mar 24, 2009 at 9:27 AM, Jason Grout
jason-s...@creativetrax.com wrote:
Jose Guzman wrote:
kcrisman wrote:
In looking at your code, I had an idea about specifying
colors. Why
don't we have some default color objects defined in Sage, like
red,
blue, yellow, green, etc. Methods could include .darker
(), .lighter(),
etc. So you could specify a plot as:
plot(x^2, (x,0,1), color=red)
plot(x^3, (x,0,1), color=blue.darker())
plot(x^4, (x,0,1), color=green.lighter())
plot(x^5, (x,0,1), color=red+blue) #gives purple :)
and then for the more esoteric names (all of the standard web
colors,
all of the standard x11 colors, etc.), use the color namespace.
plot(sin(x), (x,0,1), color=color.goldenrod)
This sounds great; presumably it wouldn't be too hard to do, if
very
annoying (particularly because some of the plot methods only allow
rgbcolor, others allow cmap options, etc.) - though what if I
want red
to stand for some other Python/Sage object? And of course only
English colors would be there, and what about gray/grey ...
By the way, other readers of this thread please note:
sage: plot(x^2, (x,0,1), color='red')
works fine!
- kcrisman
I particularly like the rgbcolor notation. That's the only way
I found
to have vector graphic environment (i.e inkscape) to match with
matplotlib or sage . On the other hand I usually use some kind
of ...
plot (x**2, (0,1), rgbcolor=(0.5,0.5,0) ) # dark green
because I found the default green color (rgbcolor=(0,1,0)) looks
too
brilliant with some beamers when you give a talk. Anyway, I
tried with
rgbcolor='blue' ,'red','green','yellow','black','orange' and
worked fine.
Yes, I'm saying that in addition to being able to pass a tuple or
string, we'd be able to pass a sage color object.
That's a great idea, which is why I implemented it over a year
ago :-)
sage: C = Color('red')# a Sage color object
sage: C
RGB color (1.0, 0.0, 0.0)
sage: C.html_color()
'#ff'
sage: plot(x^2, (x,0,1), color=C)
I think the only strings allowed in the Color constructor are:
red : (1.0,0.0,0.0),
orange: (1.0,.5,0.0),
yellow: (1.0,1.0,0.0),
green : (0.0,1.0,0.0),
blue : (0.0,0.0,1.0),
purple: (.5,0.0,1.0),
white : (1.0,1.0,1.0),
black : (0.0,0.0,0.0),
grey : (.5,.5,.5)
You can also use any html color strings.
To give the functionality you want, you could add methods lighter()
and darker() to the existing color object.
So how about:
* predefining a bunch of colors in the global namespace (maybe just
what
is available in the current strings?)
I like all your comments but this one--the global namespace is huge
enough as it is. Also, colors.* gives nice tab completion, etc. I
could be OK with the limited set defined above.
* predefining a huge number of colors, but sticking them in the colors
namespace
* making some nicely matched color sets (color schemes, if you will).
* make a generic mixing function (which takes the weighted average of
self and other, according to a specifiable fraction)
* make darker/lighter functions
* adding together colors averages them
* a linear combination takes a weighted average (hmmm...have to think
about how to do this one...maybe it'd make more sense to do a
different
average?)
Here is what MMA does with colors:
http://reference.wolfram.com/mathematica/guide/Colors.html
+1. As well as rgb, we should offer hsb, hsv ways of constructing
colors.
- Robert
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[sage-support] Re: Problem plotting a function with plot()
Robert Bradshaw wrote: * predefining a bunch of colors in the global namespace (maybe just what is available in the current strings?) I like all your comments but this one--the global namespace is huge enough as it is. Also, colors.* gives nice tab completion, etc. I could be OK with the limited set defined above. * predefining a huge number of colors, but sticking them in the colors namespace * making some nicely matched color sets (color schemes, if you will). * make a generic mixing function (which takes the weighted average of self and other, according to a specifiable fraction) * make darker/lighter functions * adding together colors averages them * a linear combination takes a weighted average (hmmm...have to think about how to do this one...maybe it'd make more sense to do a different average?) Here is what MMA does with colors: http://reference.wolfram.com/mathematica/guide/Colors.html +1. As well as rgb, we should offer hsb, hsv ways of constructing colors. Okay, see: http://trac.sagemath.org/sage_trac/ticket/5601 http://trac.sagemath.org/sage_trac/ticket/5602 http://trac.sagemath.org/sage_trac/ticket/5603 http://trac.sagemath.org/sage_trac/ticket/5604 http://trac.sagemath.org/sage_trac/ticket/5605 If anyone wants to do these, feel free! Jason --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
