Re: [Matplotlib-users] TypeError: can't multiply sequence by non-int of type 'float'
On 2015/09/28 5:43 AM, Benjamin Root wrote: > Confirmed using a fairly recent matplotlib checkout. Could you file a > bug report? This is going to need some investigating. Line3D.set_3d_properties is not doing anything to turn zs into an ndarray; in fact, when zs is a scalar, it is turning it into a list. I suspect this is the place to make it an array. Probably better here than anywhere farther down. It also looks to me like Line3D.__init__ should be using self.set_3d_properties. -- ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] TypeError: can't multiply sequence by non-int of type 'float'
Le 28/09/2015 21:03, Benjamin Root a écrit : > Where does he multiply a list by a float? The traceback shows the > multiplication happening much further down in the draw stack. Look, Benjamin Root, I don't know, and I will not "investigate" where this operation happens. The diagnosis is a standard Python message. Thus, I took the program of Shakhti Kannan, and in a few seconds I changed x = [1.0, 2.0, 3.0] into x = np.array([1.0, 2.0, 3.0]) and in update_line: x.append(1.0) into x=np.concatenate((x,[1.0])) And the program began to run without error messages. So, please, these are FACTS: somewhere the lists x,y,z get down in this draw stack. > That shouldn't matter. ax.plot() accepts lists as valid inputs and it > should be converting them into numpy arrays under the hood. There are two different issues, accepting any sequences/iterators is one, converting them into arrays - another one. This second operation visibly doesn't take place. J. Karczmarczuk -- ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] TypeError: can't multiply sequence by non-int of type 'float'
Jerzy, On Mon, Sep 28, 2015 at 4:25 PM, Jerzy Karczmarczuk < jerzy.karczmarc...@unicaen.fr> wrote: > > Le 28/09/2015 21:03, Benjamin Root a écrit : > >> Where does he multiply a list by a float? The traceback shows the >> multiplication happening much further down in the draw stack. >> > > Look, Benjamin Root, I don't know, and I will not "investigate" where this > operation happens. I did not ask you to investigate anything for me. You made the assertion that the user was multiplying a list by a float, therefore, I assumed that you were seeing something that I had not seen. > The diagnosis is a standard Python message. Thus, I took the program of > Shakhti Kannan, and in a few seconds I changed > > > x = [1.0, 2.0, 3.0] into x = np.array([1.0, 2.0, 3.0]) > > and in update_line: x.append(1.0) into x=np.concatenate((x,[1.0])) > > And the program began to run without error messages. So, please, these are > FACTS: somewhere the lists x,y,z get down in this draw stack. > > I realize that, and that isn't in dispute. Nowhere did I say that converting the lists into numpy arrays would not solve the problem. > That shouldn't matter. ax.plot() accepts lists as valid inputs and it >> should be converting them into numpy arrays under the hood. >> > > There are two different issues, accepting any sequences/iterators is one, > converting them into arrays - another one. This second operation visibly > doesn't take place. > > Of course the second operation isn't visible. I did say that it happens "under the hood". His program is perfectly valid (albeit not ideal) and demonstrated a bug in matplotlib's codebase. That is why I asked him to file a bug report. My reading of your email is that you are upset for some reason, but I have no clue why. Ben Root -- ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] TypeError: can't multiply sequence by non-int of type 'float'
On 28/09/15 22:25, Jerzy Karczmarczuk wrote: > > Le 28/09/2015 21:03, Benjamin Root a écrit : >> Where does he multiply a list by a float? The traceback shows the >> multiplication happening much further down in the draw stack. > > Look, Benjamin Root, I don't know, and I will not "investigate" where > this operation happens. The diagnosis is a standard Python message. > Thus, I took the program of Shakhti Kannan, and in a few seconds I changed > > > x = [1.0, 2.0, 3.0] into x = np.array([1.0, 2.0, 3.0]) > > and in update_line: x.append(1.0) into x=np.concatenate((x,[1.0])) > > And the program began to run without error messages. So, please, these > are FACTS: somewhere the lists x,y,z get down in this draw stack. No one is doubting that. >> That shouldn't matter. ax.plot() accepts lists as valid inputs and it >> should be converting them into numpy arrays under the hood. > > There are two different issues, accepting any sequences/iterators is > one, converting them into arrays - another one. This second operation > visibly doesn't take place. And this is a bug in matplotlib that needs to be fixed. Your solution is just a workaround to an existing problem in matplotlib. Cheers, Daniele -- ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] New version of "scipy lecture notes"
Dear Pythonistas, We have just released a new version of the "scipy lecture notes": http://www.scipy-lectures.org/ These are a consistent set of materials to learn the core aspects of the scientific Python ecosystem, from beginner to expert. They are written and maintained by a set of volunteers and published under a CC-BY license. Highlights of the latest version includes: * a chapter giving a introduction to statistics in Python * a new layout with emphasis on readability including on small devices * fully doctesting for Python 2 and 3 compatibility We hope that you will find these notes useful, for you, your colleagues, or your students. Gaël -- ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
