Mailman 3 August 2017 - Matplotlib-users

Windows7: figure window "not responding"
by Strozzi, David J. Oct. 9, 2017

Oct. 9, 2017

This problem has been driving me nuts, posted it elsewhere, so far no one's been able to help. I am running Python 3.6.1 from Anaconda (all packages updated to latest and greatest) on Windows 7. ipython and mpl figure windows work fine from a console, or spyder. The problem is when I try running ipython within emacs using elpy. To back up, the workflow I'm shooting for is using emacs as my IDE, and running python within emacs. I've done this for many years with the Yorick interpreter, and it's quite addictive. I get the same problem whether I use the GNU windows build of emacs, or emacs -nw (terminal, no X) from cygwin (ver 25.2 both cases). elpy seems to be a good Python package for emacs, and nominally supports using ipython. OK, so - I can use ipython + emacs + elpy. The only problem is matplotlib figures. When I do figure(), a figure window appears, but is not fully rendered (e.g. no buttons), and the window title says "Not responding". If I do a plot(), nothing is plotted. Playing with ion() and show() doesn't help. I've posted this on the elpy github, various stackexchange forums, no one has had any ideas yet. Any help is greatly appreciated! Dave

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selecting points inside plot
by Jean-Philippe Grivet Sept. 8, 2017

Sept. 8, 2017

Hello, I use Win7 and the Anaconde suite of Python programs. I am trying to write a piece of software to demonstrate the computation of electric potentials. The software should ; - allow a user to select (with a mouse click) a point inside a blank rectangle, - record the x and y coordinates of that point - draw a dot at that location - ask the user for the value of the charge located there and record that - repeat a few times - compute the electric potential and draw a contour plot of that function. There are several pieces of code available showing how to print the x,y coor- dinates of a mouse click but I can't devise a way to retrieve thes values for turther computations nor can I dra a dot at the corresponding location or insert a dialog to get the charge values. I would be grateful for any suggestion. JP Grivet --- L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel antivirus Avast. https://www.avast.com/antivirus

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Matplotlib quiver
by Raju Ankleshwaria Aug. 24, 2017

Aug. 24, 2017

Dear Matplotlib help, I have successfully created plots with quiver. The script is working. However, I want to create multiple plots (quiver) with different datasets. Due to the differences in datasets the length of the quiver is changing in each plot. How can I keep the quiver length same in each plots? Note, I do want variations in quiver length in the plot. I don't want the length of each quiver equal in same plot. I am using below in my script. Q=ax.quiver(x, y, u, v, pivot-'tip') qk = ax.quiverkey(Q, 0.78, 0.78, 5, '5 mph', labelpos='E', coordinates=figure') 1. scale function will not work. 2. Normalizing the data will also not work Please suggest/help. RA

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Re: [Matplotlib-users] Windows7: figure window "not responding"
by Thibault Marin Aug. 20, 2017

Aug. 20, 2017

Hi, Sorry for breaking the thread, I have just subscribed to the list and I don't know how to respond to a message that predates my subscription. I hope this messages makes its way. I believe I have a similar setup (Windows + emacs + Qt5Agg, python 3.5 and matplotlib 2+). I also see freezes when starting ipython from within emacs. The way I work around that is by using org-mode and ob-ipython (https://github.com/gregsexton/ob-ipython). To work with matplotlib, I do the following: 1 - Open my org file, which starts with something like: ,---- | #+PROPERTY: header-args :eval no-export :session Python | | #+NAME: py-startup-0 | #+BEGIN_SRC ipython :results silent :exports none | # %% Standard imports | # General | import os | import sys | import re | import matplotlib as mpl | mpl.use('Qt5Agg') | #+END_SRC `---- 2 - Execute the source block (move point at the beginning of the "BEGIN_SRC line" and C-c C-c) I then get a warning about the interpreter which I ignore. Note that it sometimes hangs at that point, in which case I use C-g. 3 - The *Python* buffer then contains the ipython session, in which I can use matplotlib: I get not freezes and calls do not block the ipython instance. Note that I have to run `plt.ion()` once to get matplotlib figures to show up. 4 - I usually write most of my code in org-mode anyway, but after running the source block I can open any .py file and work with it ignoring the org-mode part. For completeness, my emacs init file contains the following: ,---- | (when (eq system-type 'windows-nt) | (progn | (setq python-shell-interpreter-args "--simple-prompt -i") | (setq ob-ipython-command "ipython"))) `---- I hope this helps. thibault On Sat, Aug 5, 2017 at 12:39 PM Strozzi, David J. <strozzi2-i2BcT+NCU+M(a)public.gmane.org> wrote: > This problem has been driving me nuts, posted it elsewhere, so far no one's been able to help. I am running Python 3.6.1 from Anaconda (all packages updated to latest and greatest) on > Windows 7. ipython and mpl figure windows work fine from a console, or spyder. The problem is when I try running ipython within emacs using elpy. > > To back up, the workflow I'm shooting for is using emacs as my IDE, and running python within emacs. I've done this for many years with the Yorick interpreter, and it's quite addictive. I get > the same problem whether I use the GNU windows build of emacs, or emacs -nw (terminal, no X) from cygwin (ver 25.2 both cases). elpy seems to be a good Python package for emacs, and > nominally supports using ipython. > > OK, so - I can use ipython + emacs + elpy. The only problem is matplotlib figures. When I do figure(), a figure window appears, but is not fully rendered (e.g. no buttons), and the window title > says "Not responding". If I do a plot(), nothing is plotted. Playing with ion() and show() doesn't help. > > I've posted this on the elpy github, various stackexchange forums, no one has had any ideas yet. > > Any help is greatly appreciated! > > Dave >

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multiple lines in 1 graph
by stefanxfg Aug. 18, 2017

Aug. 18, 2017

Hi, i have a matplotlib graph and i want to insert several lines or linesets to the graph. Until here no problem. I also want to see curser lines by adding onMouseMove-Event through 'motion_modify_event'-declaration. My problem is, that only the first drawn line is visible after mmoving the mouse on the graph. When the graph is only loaded, everything is visible, but by moving the mouse the second plot will be invisible.I dont know, whats the problem. THis is my code.def PlotInput(self): self.fig = Figure (figsize=(5,4), dpi=100) self.canvas = FigureCanvasTkAgg(self.fig,self) self.ax = self.fig.add_subplot(111) self.ax = self.fig.add_subplot(111) #fuer 2d-Plot self.ax.set_title('Definition der LRUGL') self.ax.set_xlabel('Breite y [mm]') self.ax.set_ylabel('Höhe z [mm]') self.ax.axis([-2000,2000,0, 5000]) self.ax.grid(True) self.toolbar = NavigationToolbar2TkAgg(self.canvas,self) self.toolbar.update() self.plot_widget = self.canvas.get_tk_widget() self.plot_widget.pack(side=tk.TOP, fill=tk.BOTH, expand=1) self.toolbar.pack(side=tk.BOTTOM, fill=tk.BOTH, expand=1) self.ax.plot(np.zeros(100)) def onMouseMove(event): self.ax.lines = [self.ax.lines[0]] if event.xdata and event.ydata: # python3 often has None self.ax.axhline(y=event.ydata, color="k") self.ax.axvline(x=event.xdata, color="k") self.fig.canvas.show() self.canvas.mpl_connect('motion_notify_event', onMouseMove) self.canvas.show() def fig_ax_request(x, y, x2): self.ax.clear() ya = np.array(x) za = np.array(y) yb = np.array(x2) self.ax.plot(yb,za, color='red', linestyle='--', marker='') self.fig.canvas.draw() self.ax.plot(ya,za, color='red', linestyle='--', marker='') self.fig.canvas.draw() subscribe('UPDATE_LRUGL_GRAPH', 'DRAW_INFO') subscribe('DRAW_INFO', fig_ax_request) subscribe('LRUGL_FIRST_DRAW', 'DRAW_FIRST') subscribe('DRAW_FIRST', fig_ax_request)The subscribes get lists to fill the graph. The first expression updates the graph when data already exists in a gui table. The second expression fills the graph by loading a file. So the parameters "x","y","x2" are lists. -- View this message in context: http://matplotlib.1069221.n5.nabble.com/multiple-lines-in-1-graph-tp48236.h… Sent from the matplotlib - users mailing list archive at Nabble.com.

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Horizontal Waterfall
by Thomas D. Dean Aug. 18, 2017

Aug. 18, 2017

I am attempting to plot a data stream in a waterfall which moves horizontally. My datastream has one point every 2 seconds. I want to have datetime stamps in the display. Like Figure 5-1 in https://www.britastro.org/radio/downloads /Further_Developments_SDR_Telescope.pdf Is this possible? Tom Dean

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Horizontal Waterfall time vs amplitude
by tomdean Aug. 18, 2017

Aug. 18, 2017

I am attempting to plot a data stream in a waterfall which moves horizontally. My datastream has one point every 2 seconds. I want to have datetime stamps in the display. Like Figure 5-1 in https://www.britastro.org/radio/downloads/Further_Developments_SDR_Telescop… Is this possible? Tom Dean -- View this message in context: http://matplotlib.1069221.n5.nabble.com/Horizontal-Waterfall-time-vs-amplit… Sent from the matplotlib - users mailing list archive at Nabble.com.

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Why the V parameter in matplotlib.axes.Axes.contour must be increasing?
by Xi Shen Aug. 17, 2017

Aug. 17, 2017

Hi, https://matplotlib.org/api/_as_gen/matplotlib.axes.Axes.contour.html says the contour function accept a vector parameter V which must be in increasing value. But the contour function in MATLAB does not have this restriction. I understand the underlining implementation of these two functions could be very different. I want to understand what is the purpose of this restriction, and if it possible to create a contour image the same as MATLAB does by using contour with V = [0 0]? Regards, David

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Setting rcParams ps.fonttype = 42 yields unreadable eps
by pauljdurack Aug. 16, 2017

Aug. 16, 2017

I created a bug report at https://github.com/matplotlib/matplotlib/issues/9044, but in the mean time I am keen to get some help from this user group. I'm trying to create an eps output from matplotlib 2.0.2 with editable text (truetype). I've used the settings: import matplotlib matplotlib.rcParams['ps.fonttype'] = 42 Which yields a file size increase from 19Kb to 1.2Mb, but no software (MacOS Preview, or Adobe Photoshop 2017) can read the file. For those interested I have attached both `*.eps` output files in the zip archive at the link at the top of the page. The truetype (ps.fonttype = 42) file contains the following, and `DejaVu Sans` doesn't appear to be installed (checking the MacOS Font Book application): ... %!PS-TrueTypeFont-1.0-2.22937 %%Title: DejaVu Sans %%Copyright: Copyright (c) 2003 by Bitstream, Inc. All Rights Reserved. Copyright (c) 2006 by Tavmjong Bah. All Rights Reserved. DejaVu changes are in public domain %%Creator: Converted from TrueType to type 42 by PPR ... A demo script to reproduce the problem is: import matplotlib from matplotlib import pyplot as plt fig = plt.figure(dpi=100, facecolor='w', edgecolor='w') ax1 = plt.subplot2grid((2,2), (0, 0), rowspan=2, facecolor='w') ax2 = plt.subplot2grid((2,2), (0, 1), facecolor='w') ax3 = plt.subplot2grid((2,2), (1, 1), facecolor='w') matplotlib.rcParams['ps.fonttype'] = 3 fig.savefig('demo-type3.eps') <- Opens fine matplotlib.rcParams['ps.fonttype'] = 42 fig.savefig('demo-type42.eps') <- Errors on all applications I have tried System config: * Operating System: MacOS 10.11.6 * Matplotlib Version: 2.0.2-py27_1 (conda-forge) * Python Version: 2.7.13-1 (conda-forge) * Jupyter Version (if applicable): NA (1.0.0-py27_0 conda-forge) * Other Libraries: NA (can provide if required) * Installation path: conda (conda-forge channel) Happy to hear any tips as to how to get around this issue. Cheers, P -- View this message in context: http://matplotlib.1069221.n5.nabble.com/Setting-rcParams-ps-fonttype-42-yie… Sent from the matplotlib - users mailing list archive at Nabble.com.

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Setting rcParams ps.fonttype = 42 yields unreadable eps
by pauljdurack Aug. 16, 2017

Aug. 16, 2017

I created a bug report at https://github.com/matplotlib/matplotlib/issues/9044, but in the mean time I am keen to get some help from this user group. I'm trying to create an eps output from matplotlib 2.0.2 with editable text (truetype). I've used the settings: import matplotlib matplotlib.rcParams['ps.fonttype'] = 42 Which yields a file size increase from 19Kb to 1.2Mb, but no software (MacOS Preview, or Adobe Photoshop 2017) can read the file. For those interested I have attached both `*.eps` output files in the zip archive at the link at the top of the page. The truetype (ps.fonttype = 42) file contains the following, and `DejaVu Sans` doesn't appear to be installed (checking the MacOS Font Book application): ... %!PS-TrueTypeFont-1.0-2.22937 %%Title: DejaVu Sans %%Copyright: Copyright (c) 2003 by Bitstream, Inc. All Rights Reserved. Copyright (c) 2006 by Tavmjong Bah. All Rights Reserved. DejaVu changes are in public domain %%Creator: Converted from TrueType to type 42 by PPR ... A demo script to reproduce the problem is: import matplotlib from matplotlib import pyplot as plt fig = plt.figure(dpi=100, facecolor='w', edgecolor='w') ax1 = plt.subplot2grid((2,2), (0, 0), rowspan=2, facecolor='w') ax2 = plt.subplot2grid((2,2), (0, 1), facecolor='w') ax3 = plt.subplot2grid((2,2), (1, 1), facecolor='w') matplotlib.rcParams['ps.fonttype'] = 3 fig.savefig('demo-type3.eps') <- Opens fine matplotlib.rcParams['ps.fonttype'] = 42 fig.savefig('demo-type42.eps') <- Errors on all applications I have tried System config: * Operating System: MacOS 10.11.6 * Matplotlib Version: 2.0.2-py27_1 (conda-forge) * Python Version: 2.7.13-1 (conda-forge) * Jupyter Version (if applicable): NA (1.0.0-py27_0 conda-forge) * Other Libraries: NA (can provide if required) * Installation path: conda (conda-forge channel) Happy to hear any tips as to how to get around this issue. Cheers, P -- View this message in context: http://matplotlib.1069221.n5.nabble.com/Setting-rcParams-ps-fonttype-42-yie… Sent from the matplotlib - users mailing list archive at Nabble.com.

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