Re: [Matplotlib-users] odd "singular matrix" error
Still though, I thought we had enough logic checks to prevent this sort of >> error. I see you are using Python 2.5, which is older than what we >> currently support. Which version of matplotlib are you using? >> > > I'm using matplotlib 1.1.0. I could try upgrading. > Ben and others, OK, I tried upgrading to Python 2.6 and Matplotlib 1.4.2. The problem with the singular matrix goes away! But... ...But now I have no patch shown on the plot. This is the function I am using now to add a patch (editing to just keep the MPL relevant stuff)...maybe this is no longer a good way?: def AddPatch(self,): ax = self.subplot verts = [ (start, y-scaling_value), # left, bottom (start, y+scaling_value), # left, top (stop, y+scaling_value), # right, top (stop, y-scaling_value), # right, bottom (0., 0.), # ignored ] codes = [Path.MOVETO, Path.LINETO, Path.LINETO, Path.LINETO, Path.CLOSEPOLY, ] x = [start, stop] # x range of box (in data coordinates) height = 12 # of box in device coords (pixels) path = mpath.Path([[x[0], -height], [x[1], -height], [x[1], height], [x[0], height], [x[0], -height]]) #USING THE NEW TRANSFORMS fixed_pt_trans = FixedPointOffsetTransform(ax.transData, (0, y)) xdata_yfixed = mtrans.blended_transform_factory(ax.transData, fixed_pt_trans) patch = patches.PathPatch(path, transform=xdata_yfixed, facecolor=color,alpha=0.4, lw=1, edgecolor='grey') ax.add_patch(patch) -- Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] odd "singular matrix" error
On Wed, Dec 31, 2014 at 9:45 AM, Benjamin Root wrote: > What might be happening is that the patch being added has no area. The > logic it is failing in is in the autoscaling section, I believe. This is > why if there are other things already in the plot or with other patches, > then the code works fine because the limits aren't identical. > If it is helpful, when I print the value of the patch, I get this: patch is: Poly((735597, -12) ...) What's weird though, is that the other plot I'm talking about is a *different* plot entirely (different canvas instance), and can be closed first and still "allow" the patch plot to be shown without errors. > > Still though, I thought we had enough logic checks to prevent this sort of > error. I see you are using Python 2.5, which is older than what we > currently support. Which version of matplotlib are you using? > I'm using matplotlib 1.1.0. I could try upgrading. > > Cheers! > Ben Root > > > On Wed, Dec 31, 2014 at 2:03 AM, C M wrote: > >> I have no idea what this is. If I create a certain plot first in an >> application, it throws this error (edited to the key part): >> >> Traceback (most recent call last): >> >> File "thescript.py", line 2147, in AddPatchBar >> ax.add_patch(patch) >> File "C:\Python25\lib\site-packages\matplotlib\axes.py", line 1471, in >> add_patch >> self._update_patch_limits(p) >> File "C:\Python25\lib\site-packages\matplotlib\axes.py", line 1492, in >> _update_patch_limits >> self.transData.inverted()) >> File "C:\Python25\lib\site-packages\matplotlib\transforms.py", line >> 1954, in inverted >> return CompositeGenericTransform(self._b.inverted(), >> self._a.inverted()) >> File "C:\Python25\lib\site-packages\matplotlib\transforms.py", line >> 1448, in inverted >> self._inverted = Affine2D(inv(mtx)) >> File "C:\Python25\lib\site-packages\numpy\linalg\linalg.py", line 445, >> in inv >> return wrap(solve(a, identity(a.shape[0], dtype=a.dtype))) >> File "C:\Python25\lib\site-packages\numpy\linalg\linalg.py", line 328, >> in solve >> raise LinAlgError, 'Singular matrix' >> numpy.linalg.linalg.LinAlgError: Singular matrix >> >> But, the odd part is that if I create a completely different and totally >> separate plot *before* this one, and *then* I try to plot this one, I do >> not get this error and this plot shows fine. That makes no sense to me. Or >> also, if I plot this "patch" on a plot with a few other lines plotted, it >> also works. >> >> Does anyone have any idea what could be causing this? Thanks. >> >> >> >> -- >> Dive into the World of Parallel Programming! The Go Parallel Website, >> sponsored by Intel and developed in partnership with Slashdot Media, is >> your >> hub for all things parallel software development, from weekly thought >> leadership blogs to news, videos, case studies, tutorials and more. Take a >> look and join the conversation now. http://goparallel.sourceforge.net >> ___ >> Matplotlib-users mailing list >> Matplotlib-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/matplotlib-users >> >> > -- Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] odd "singular matrix" error
What might be happening is that the patch being added has no area. The logic it is failing in is in the autoscaling section, I believe. This is why if there are other things already in the plot or with other patches, then the code works fine because the limits aren't identical. Still though, I thought we had enough logic checks to prevent this sort of error. I see you are using Python 2.5, which is older than what we currently support. Which version of matplotlib are you using? Cheers! Ben Root On Wed, Dec 31, 2014 at 2:03 AM, C M wrote: > I have no idea what this is. If I create a certain plot first in an > application, it throws this error (edited to the key part): > > Traceback (most recent call last): > > File "thescript.py", line 2147, in AddPatchBar > ax.add_patch(patch) > File "C:\Python25\lib\site-packages\matplotlib\axes.py", line 1471, in > add_patch > self._update_patch_limits(p) > File "C:\Python25\lib\site-packages\matplotlib\axes.py", line 1492, in > _update_patch_limits > self.transData.inverted()) > File "C:\Python25\lib\site-packages\matplotlib\transforms.py", line > 1954, in inverted > return CompositeGenericTransform(self._b.inverted(), > self._a.inverted()) > File "C:\Python25\lib\site-packages\matplotlib\transforms.py", line > 1448, in inverted > self._inverted = Affine2D(inv(mtx)) > File "C:\Python25\lib\site-packages\numpy\linalg\linalg.py", line 445, > in inv > return wrap(solve(a, identity(a.shape[0], dtype=a.dtype))) > File "C:\Python25\lib\site-packages\numpy\linalg\linalg.py", line 328, > in solve > raise LinAlgError, 'Singular matrix' > numpy.linalg.linalg.LinAlgError: Singular matrix > > But, the odd part is that if I create a completely different and totally > separate plot *before* this one, and *then* I try to plot this one, I do > not get this error and this plot shows fine. That makes no sense to me. Or > also, if I plot this "patch" on a plot with a few other lines plotted, it > also works. > > Does anyone have any idea what could be causing this? Thanks. > > > > -- > Dive into the World of Parallel Programming! The Go Parallel Website, > sponsored by Intel and developed in partnership with Slashdot Media, is > your > hub for all things parallel software development, from weekly thought > leadership blogs to news, videos, case studies, tutorials and more. Take a > look and join the conversation now. http://goparallel.sourceforge.net > ___ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users > > -- Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] odd "singular matrix" error
I have no idea what this is. If I create a certain plot first in an application, it throws this error (edited to the key part): Traceback (most recent call last): File "thescript.py", line 2147, in AddPatchBar ax.add_patch(patch) File "C:\Python25\lib\site-packages\matplotlib\axes.py", line 1471, in add_patch self._update_patch_limits(p) File "C:\Python25\lib\site-packages\matplotlib\axes.py", line 1492, in _update_patch_limits self.transData.inverted()) File "C:\Python25\lib\site-packages\matplotlib\transforms.py", line 1954, in inverted return CompositeGenericTransform(self._b.inverted(), self._a.inverted()) File "C:\Python25\lib\site-packages\matplotlib\transforms.py", line 1448, in inverted self._inverted = Affine2D(inv(mtx)) File "C:\Python25\lib\site-packages\numpy\linalg\linalg.py", line 445, in inv return wrap(solve(a, identity(a.shape[0], dtype=a.dtype))) File "C:\Python25\lib\site-packages\numpy\linalg\linalg.py", line 328, in solve raise LinAlgError, 'Singular matrix' numpy.linalg.linalg.LinAlgError: Singular matrix But, the odd part is that if I create a completely different and totally separate plot *before* this one, and *then* I try to plot this one, I do not get this error and this plot shows fine. That makes no sense to me. Or also, if I plot this "patch" on a plot with a few other lines plotted, it also works. Does anyone have any idea what could be causing this? Thanks. -- Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
