Re: [Matplotlib-users] one data set, two y axis scales
Jae-Joon Lee wrote:
...
def Tc(Tf): return (5./9.)*(Tf-32)
ax1 = subplot(111) # y-axis in F
ax2 = twinx() # y-axis in C
def update_ax2(ax1):
y1, y2 = ax1.get_ylim()
ax2.set_ylim(Tc(y1), Tc(y2))
# automatically update ylim of ax2 when ylim of ax1 changes.
ax1.callbacks.connect(ylim_changed, update_ax2)
ax1.plot([78, 79, 79, 77])
...
Thanks, this was also useful for me. I see that you are discussing
shortcomings of twinx -- so perhaps the following is one of those...
I was using this exact script with an additional
ax1.set_yscale('log')
ax2.set_yscale('log')
and the ticks seem to be messed up. I used 'ipython -pylab' with
matplotlib.__version__ '0.98.3'.
Is there something I can do to get the ticks only at the places i would
like them to be?
Thanks,
Sebastian.
signature.asc
Description: OpenPGP digital signature
--
OpenSolaris 2009.06 is a cutting edge operating system for enterprises
looking to deploy the next generation of Solaris that includes the latest
innovations from Sun and the OpenSource community. Download a copy and
enjoy capabilities such as Networking, Storage and Virtualization.
Go to: http://p.sf.net/sfu/opensolaris-get___
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] one data set, two y axis scales
On Thu, Jun 4, 2009 at 12:16 PM, Jae-Joon Leelee.j.j...@gmail.com wrote: I hope the code below gives you some idea. def Tc(Tf): return (5./9.)*(Tf-32) ax1 = subplot(111) # y-axis in F ax2 = twinx() # y-axis in C def update_ax2(ax1): y1, y2 = ax1.get_ylim() ax2.set_ylim(Tc(y1), Tc(y2)) # automatically update ylim of ax2 when ylim of ax1 changes. ax1.callbacks.connect(ylim_changed, update_ax2) ax1.plot([78, 79, 79, 77]) Yes, this is a cute little example. I was thinking along the lines Ryan was, to just plot the same data twice with twinx, but this is cleverer. I added it to svn as: examples/api/fahrenheit_celcius_scales.py But using twinx has always been a hack. I think what we really need is to have each spine have it's own locator, formatter and tick collection (eg the natural points for Celcius ticks are different from the natural points for Fahrenheit ticks) and currently the left and right ticks of an axis share the axis locator and formatter. Currently the spines just draw the lines and the axes/axis handle all the ticks and the locators. It might be more natural to move these into the spine itself, and support independent ticks/locators/formatter for each spine, with the default being shared. Andrew, did you give this any thought in the spine implementation? I am pretty sure it would be hard, but maybe you have a better sense of *how hard*. This would be a nice enhancement. JDH -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] one data set, two y axis scales
John Hunter wrote: On Thu, Jun 4, 2009 at 12:16 PM, Jae-Joon Leelee.j.j...@gmail.com wrote: I hope the code below gives you some idea. def Tc(Tf): return (5./9.)*(Tf-32) ax1 = subplot(111) # y-axis in F ax2 = twinx() # y-axis in C def update_ax2(ax1): y1, y2 = ax1.get_ylim() ax2.set_ylim(Tc(y1), Tc(y2)) # automatically update ylim of ax2 when ylim of ax1 changes. ax1.callbacks.connect(ylim_changed, update_ax2) ax1.plot([78, 79, 79, 77]) Yes, this is a cute little example. I was thinking along the lines Ryan was, to just plot the same data twice with twinx, but this is cleverer. I added it to svn as: examples/api/fahrenheit_celcius_scales.py But using twinx has always been a hack. I think what we really need is to have each spine have it's own locator, formatter and tick collection (eg the natural points for Celcius ticks are different from the natural points for Fahrenheit ticks) and currently the left and right ticks of an axis share the axis locator and formatter. Currently the spines just draw the lines and the axes/axis handle all the ticks and the locators. It might be more natural to move these into the spine itself, and support independent ticks/locators/formatter for each spine, with the default being shared. Andrew, did you give this any thought in the spine implementation? I am pretty sure it would be hard, but maybe you have a better sense of *how hard*. This would be a nice enhancement. I think this would be a good direction, as well. It would also allow disabling the tick mark labels in some axes that share the same axis -- because the ticks/labels would belong to the spine, which itself wouldn't (necessarily) be shared. I can't promise anything, but this may be a solution to the issues that Jae-Joon pointed out w.r.t loglog plots in the spine implementation (although I suspect they are more general). I'll take a look at it, although I can't say exactly when I'll do so -- hopefully within the coming week. -Andrew -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] one data set, two y axis scales
On Fri, Jun 5, 2009 at 11:44 AM, Andrew Strawstraw...@astraw.com wrote: I think this would be a good direction, as well. It would also allow disabling the tick mark labels in some axes that share the same axis -- because the ticks/labels would belong to the spine, which itself wouldn't (necessarily) be shared. I can't promise anything, but this may be a solution to the issues that Jae-Joon pointed out w.r.t loglog plots in the spine implementation (although I suspect they are more general). I'll take a look at it, although I can't say exactly when I'll do so -- hopefully within the coming week. If you go this route, you may want to look at abolishing the Tick class entirely -- once the ticks are associated with a spine, we will not need the tick1line, tick2line, label1, label2 instances. We can draw all the ticks along a given spine with a single Line2D object using the marker styles TICKLEFT, TICKRIGHT, TICKUP, and TICKDOWN. We really do not need heterogeneous properties along a given spine, so we are paying a lot to have separate artist instances for each of these things. The tick labels will be a little harder since Text is so complicated, so you might want to punt at the outset and just have the spine hold a list of Text instances, and down the road we can think about a more efficient text collection if necessary. Thinking out loud But for nonlinear coordinate systems, where ticks may be oriented in different directions, the single Line2D idea may not work so tread cautiously -- perhaps a line collection for the tick lines I am willing to have some breakage in support of this, though we can try to make the top level axes methods accessor (e get_xticklabels) do the intuitive thing. JDH -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] one data set, two y axis scales
John, These ideas have been part of motivation behind my axes_grid toolkit. In the module documentation of lib/mpl_toolkits/axes_grid/axislines.py, I tried to briefly explain what I wanted and what I implemented, although the explanation is very far from complete (also some examples are found in http://matplotlib.sourceforge.net/mpl_toolkits/axes_grid/users/overview.html#axisline ). Note that my ultimate goal was to support the curvelinear coordinate system, as demonstrated in my recent example (examples/axes_grid/demo_curvelinear_grid.py). And my hope is that, if we're going to this direction and somehow expand the spines to support these ideas, please make it possible to customize and expand although only the basic features are supported by the vanilla mpl. For example, in curvelinear coordinate, ticks can have arbitrary angles, so I hope that the tickstyles are not strictly limited to [TICKLEFT, TICKRIGHT, TICKUP, TICKDOWN] by design. It would be great if there is a chance to discuss about the overall design before implementing something in this regard. My current implementation in axes_grid toolkit became rather complicated, and some of them are implemented in quick and dirty ways. However, I guess it would be helpful to go over how thing are currently implemented in axes_grid toolkit and further discuss how we're going to do this within the mpl. I'll try to write up short documentation about my design during this weekend. Regards, -JJ On Fri, Jun 5, 2009 at 1:07 PM, John Hunterjdh2...@gmail.com wrote: On Fri, Jun 5, 2009 at 11:44 AM, Andrew Strawstraw...@astraw.com wrote: I think this would be a good direction, as well. It would also allow disabling the tick mark labels in some axes that share the same axis -- because the ticks/labels would belong to the spine, which itself wouldn't (necessarily) be shared. I can't promise anything, but this may be a solution to the issues that Jae-Joon pointed out w.r.t loglog plots in the spine implementation (although I suspect they are more general). I'll take a look at it, although I can't say exactly when I'll do so -- hopefully within the coming week. If you go this route, you may want to look at abolishing the Tick class entirely -- once the ticks are associated with a spine, we will not need the tick1line, tick2line, label1, label2 instances. We can draw all the ticks along a given spine with a single Line2D object using the marker styles TICKLEFT, TICKRIGHT, TICKUP, and TICKDOWN. We really do not need heterogeneous properties along a given spine, so we are paying a lot to have separate artist instances for each of these things. The tick labels will be a little harder since Text is so complicated, so you might want to punt at the outset and just have the spine hold a list of Text instances, and down the road we can think about a more efficient text collection if necessary. Thinking out loud But for nonlinear coordinate systems, where ticks may be oriented in different directions, the single Line2D idea may not work so tread cautiously -- perhaps a line collection for the tick lines I am willing to have some breakage in support of this, though we can try to make the top level axes methods accessor (e get_xticklabels) do the intuitive thing. JDH -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] one data set, two y axis scales
Hi, On Thu, Jun 4, 2009 at 06:56, musik xi.xiaoxi...@gmail.com wrote: I want to make a plot with both y axes labeled. The one on the left (y1) will be in Fahrenheit, while the one on the right (y2) in Celsius. Is there a way to do this? what you're looking for is [1] [1] http://matplotlib.sourceforge.net/api/pyplot_api.html?highlight=twinx#matplotlib.pyplot.twinx Cheers, -- Sandro Tosi (aka morph, morpheus, matrixhasu) My website: http://matrixhasu.altervista.org/ Me at Debian: http://wiki.debian.org/SandroTosi -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] one data set, two y axis scales
On Thu, Jun 4, 2009 at 6:01 AM, Sandro Tosi matrixh...@gmail.com wrote: Hi, On Thu, Jun 4, 2009 at 06:56, musik xi.xiaoxi...@gmail.com wrote: I want to make a plot with both y axes labeled. The one on the left (y1) will be in Fahrenheit, while the one on the right (y2) in Celsius. Is there a way to do this? what you're looking for is [1] [1] http://matplotlib.sourceforge.net/api/pyplot_api.html?highlight=twinx#matplotlib.pyplot.twinx Well you can make it work that way, but I think what the original poster wants is just to plot the data once, with one set of units on the left and another on the right. Using twinx would make two identical lines just to make two different scales. It seems to me that there *should* be an easier way, but I'm not sure that one exists... Ryan -- Ryan May Graduate Research Assistant School of Meteorology University of Oklahoma Sent from Norman, Oklahoma, United States -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] one data set, two y axis scales
Exactly. I want to plot the original data once, but the two y axes show different scales (units). Is twinx() good for that? How? Thanks. Ryan May-3 wrote: On Thu, Jun 4, 2009 at 6:01 AM, Sandro Tosi matrixh...@gmail.com wrote: Hi, On Thu, Jun 4, 2009 at 06:56, musik xi.xiaoxi...@gmail.com wrote: I want to make a plot with both y axes labeled. The one on the left (y1) will be in Fahrenheit, while the one on the right (y2) in Celsius. Is there a way to do this? what you're looking for is [1] [1] http://matplotlib.sourceforge.net/api/pyplot_api.html?highlight=twinx#matplotlib.pyplot.twinx Well you can make it work that way, but I think what the original poster wants is just to plot the data once, with one set of units on the left and another on the right. Using twinx would make two identical lines just to make two different scales. It seems to me that there *should* be an easier way, but I'm not sure that one exists... Ryan -- Ryan May Graduate Research Assistant School of Meteorology University of Oklahoma Sent from Norman, Oklahoma, United States -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- View this message in context: http://www.nabble.com/one-data-set%2C-two-y-axis-scales-tp23863680p23871873.html Sent from the matplotlib - users mailing list archive at Nabble.com. -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] one data set, two y axis scales
On Thu, Jun 4, 2009 at 10:08 AM, musik xi.xiaoxi...@gmail.com wrote: Exactly. I want to plot the original data once, but the two y axes show different scales (units). Is twinx() good for that? How? I wouldn't call it good, but you can make it work. Basically, you'd plot your data once in F, then convert it to C and plot it a second time. Ryan -- Ryan May Graduate Research Assistant School of Meteorology University of Oklahoma Sent from Norman, Oklahoma, United States -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] one data set, two y axis scales
I hope the code below gives you some idea. def Tc(Tf): return (5./9.)*(Tf-32) ax1 = subplot(111) # y-axis in F ax2 = twinx() # y-axis in C def update_ax2(ax1): y1, y2 = ax1.get_ylim() ax2.set_ylim(Tc(y1), Tc(y2)) # automatically update ylim of ax2 when ylim of ax1 changes. ax1.callbacks.connect(ylim_changed, update_ax2) ax1.plot([78, 79, 79, 77]) -JJ On Thu, Jun 4, 2009 at 11:08 AM, musik xi.xiaoxi...@gmail.com wrote: Exactly. I want to plot the original data once, but the two y axes show different scales (units). Is twinx() good for that? How? Thanks. Ryan May-3 wrote: On Thu, Jun 4, 2009 at 6:01 AM, Sandro Tosi matrixh...@gmail.com wrote: Hi, On Thu, Jun 4, 2009 at 06:56, musik xi.xiaoxi...@gmail.com wrote: I want to make a plot with both y axes labeled. The one on the left (y1) will be in Fahrenheit, while the one on the right (y2) in Celsius. Is there a way to do this? what you're looking for is [1] [1] http://matplotlib.sourceforge.net/api/pyplot_api.html?highlight=twinx#matplotlib.pyplot.twinx Well you can make it work that way, but I think what the original poster wants is just to plot the data once, with one set of units on the left and another on the right. Using twinx would make two identical lines just to make two different scales. It seems to me that there *should* be an easier way, but I'm not sure that one exists... Ryan -- Ryan May Graduate Research Assistant School of Meteorology University of Oklahoma Sent from Norman, Oklahoma, United States -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- View this message in context: http://www.nabble.com/one-data-set%2C-two-y-axis-scales-tp23863680p23871873.html Sent from the matplotlib - users mailing list archive at Nabble.com. -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] one data set, two y axis scales
On Thu, Jun 4, 2009 at 12:16 PM, Jae-Joon Lee lee.j.j...@gmail.com wrote: I hope the code below gives you some idea. def Tc(Tf): return (5./9.)*(Tf-32) ax1 = subplot(111) # y-axis in F ax2 = twinx() # y-axis in C def update_ax2(ax1): y1, y2 = ax1.get_ylim() ax2.set_ylim(Tc(y1), Tc(y2)) # automatically update ylim of ax2 when ylim of ax1 changes. ax1.callbacks.connect(ylim_changed, update_ax2) ax1.plot([78, 79, 79, 77]) Well I know I just learned something Ryan -- Ryan May Graduate Research Assistant School of Meteorology University of Oklahoma Sent from Norman, Oklahoma, United States -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] one data set, two y axis scales
This works nicely. Thank you JJ. Jae-Joon Lee wrote: I hope the code below gives you some idea. def Tc(Tf): return (5./9.)*(Tf-32) ax1 = subplot(111) # y-axis in F ax2 = twinx() # y-axis in C def update_ax2(ax1): y1, y2 = ax1.get_ylim() ax2.set_ylim(Tc(y1), Tc(y2)) # automatically update ylim of ax2 when ylim of ax1 changes. ax1.callbacks.connect(ylim_changed, update_ax2) ax1.plot([78, 79, 79, 77]) -JJ On Thu, Jun 4, 2009 at 11:08 AM, musik xi.xiaoxi...@gmail.com wrote: Exactly. I want to plot the original data once, but the two y axes show different scales (units). Is twinx() good for that? How? Thanks. -- View this message in context: http://www.nabble.com/one-data-set%2C-two-y-axis-scales-tp23863680p23875221.html Sent from the matplotlib - users mailing list archive at Nabble.com. -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
