Re: [Matplotlib-users] Basic matshow question
On 7/29/14, 10:49 PM, Eric Firing wrote: > On 2014/07/29, 7:04 PM, JBB wrote: >> Hello, >> >> I am relatively new to Python, numpy, matplotlib, etc., with a >> reasonable amount of Matlab experience. ...[ Problem and test code trimmed ] > > First, at least initially for this sort of thing, run in "ipython > --pylab", and don't use any "ion()" or "ioff()". > > Second, replace the "show(); time.sleep(1)" with "pause(1)". > > I think that will do it. > > Eric > Thank you, very much. It did indeed work. Is there a pointer to why this worked when my initial approach did not? I thought from the documentation/videos that preparing a plot with relevant commands then issuing the show() command was the preferred approach within Python/Matplotlib. JBB -- Infragistics Professional Build stunning WinForms apps today! Reboot your WinForms applications with our WinForms controls. Build a bridge from your legacy apps to the future. http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Basic matshow question
On 2014/07/29, 7:04 PM, JBB wrote: > Hello, > > I am relatively new to Python, numpy, matplotlib, etc., with a > reasonable amount of Matlab experience. > > I am trying to do some simple array visualizations before moving on to > specific work. > > e.g. I have a 5x5x10 array and I'd like to see each 5x5 piece as a > "frame" with a short pause in between. I realize there are animation > methods and such but I think the code below ought to work and don't > understand what I'm getting. > > Expect: A figure window with the first 5x5 piece of the array, a short > pause, a new figure window overwriting the old one with the second 5x5 > piece, and so on. Equivalent code in Matlab does this. > > Result: Figure window opens, nothing gets drawn in it, there's a pause, > the window closes, and another window opens in the same location with > nothing in it, and so on. > > If I refresh the kernel, create the 3D array, and manually show one > slice, it works. As soon as I run the loop, all I get from then on is > blank windows whether I do it within a loop or type the matshow, show > commands. > > This happens in iPython with and without the notebook interface. > > I'm trying to understand Matplotlib in some detail and am watching the > SciPy2014 videos along with RTFM. > https://www.youtube.com/watch?v=A2adyFMsut0 et.seq. > > So far, I've come up empty in figuring out what I'm doing wrong. > > I have Python 2.7.8/Anaconda 2.0.1 > > Thanks, > > JBB > = Test code > > import numpy as np > from matplotlib.pylab import * > import time as time > > # Create a 3D array of "frames" > A = np.random.rand(5,5,10) > > #Turn on interactive mode > ion() > # Turn off interactive mode > # ioff() > > # Attempt to show each frame with a short delay between frames > for k in range(10): > matshow(A[:,:,k]) > show() > time.sleep(1) > close() > First, at least initially for this sort of thing, run in "ipython --pylab", and don't use any "ion()" or "ioff()". Second, replace the "show(); time.sleep(1)" with "pause(1)". I think that will do it. Eric > > -- > Infragistics Professional > Build stunning WinForms apps today! > Reboot your WinForms applications with our WinForms controls. > Build a bridge from your legacy apps to the future. > http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk > ___ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users > -- Infragistics Professional Build stunning WinForms apps today! Reboot your WinForms applications with our WinForms controls. Build a bridge from your legacy apps to the future. http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Basic matshow question
Hello, I am relatively new to Python, numpy, matplotlib, etc., with a reasonable amount of Matlab experience. I am trying to do some simple array visualizations before moving on to specific work. e.g. I have a 5x5x10 array and I'd like to see each 5x5 piece as a "frame" with a short pause in between. I realize there are animation methods and such but I think the code below ought to work and don't understand what I'm getting. Expect: A figure window with the first 5x5 piece of the array, a short pause, a new figure window overwriting the old one with the second 5x5 piece, and so on. Equivalent code in Matlab does this. Result: Figure window opens, nothing gets drawn in it, there's a pause, the window closes, and another window opens in the same location with nothing in it, and so on. If I refresh the kernel, create the 3D array, and manually show one slice, it works. As soon as I run the loop, all I get from then on is blank windows whether I do it within a loop or type the matshow, show commands. This happens in iPython with and without the notebook interface. I'm trying to understand Matplotlib in some detail and am watching the SciPy2014 videos along with RTFM. https://www.youtube.com/watch?v=A2adyFMsut0 et.seq. So far, I've come up empty in figuring out what I'm doing wrong. I have Python 2.7.8/Anaconda 2.0.1 Thanks, JBB = Test code import numpy as np from matplotlib.pylab import * import time as time # Create a 3D array of "frames" A = np.random.rand(5,5,10) #Turn on interactive mode ion() # Turn off interactive mode # ioff() # Attempt to show each frame with a short delay between frames for k in range(10): matshow(A[:,:,k]) show() time.sleep(1) close() -- Infragistics Professional Build stunning WinForms apps today! Reboot your WinForms applications with our WinForms controls. Build a bridge from your legacy apps to the future. http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] graphical graph - how to
The solution below is maybe not optimal, but it's something you can figure
out easily enough yourself. Also, I believe this question is better asked
on stackoverflow as it is not an actual matplotlib issue, but rather a
programming problem (that shows no effort).
Let me first redefine your matrices to comply with PEP8.
nodes = np.array([[1,2,3,4],[0, 5, 2, 8]]) # What you call Q. The first
node here is (1,0)
connections = np.triu(np.random.rand(4,4)) # What you call Z
connections[0,3] = 0 # Just to make the plot a little more clear.
for row,_ in enumerate(connections):
for col in range(row+1, connections.shape[0]):
if connections[row, col]:
plt.plot(
nodes[0,[row,col]], nodes[1,[row,col]],
color='{}'.format(connections[row, col])) # Uses
gray-scale color-coding
plt.plot(nodes[0,:], nodes[1,:], 'ko ')
2014-07-29 14:18 GMT+02:00 Josè Luis Mietta :
> Hi experts!
>
> I have:
>
> * a list of Q 'NODES'=[(x,y)_1,, (x,y)_Q], where each element
> (x,y) represent the spatial position of the node in 2D Cartesian space.
> * a matrix 'H' with QxQ elements {H_k,l}.
> H_k,l=0 if nodes 'k' and 'l' aren't joined by a edge, and H_k,l = the length
> of the edge that connects these nodes.
> * a matrix 'Z' with QxQ elements {Z_k,l}.
> Z_k,l=0 if nodes 'k' and 'l' aren't joined by a edge, and Z_k,l =
> intensity_k,l (a intensity scale of the edge, 0 nodes are connected.
>
> I want to draw the nodes in their spatial position, connected by the
> edges, and use a color scale for the 'intensity'.
>
> How must I do that?
>
> Waiting for your answers.
>
> Thanks a lot!
>
> Best regards,
> José Luis
>
>
> --
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>
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[Matplotlib-users] graphical graph - how to
Hi experts!
I have:
* a list of Q 'NODES'=[(x,y)_1,, (x,y)_Q], where each element
(x,y) represent the spatial position of the node in 2D Cartesian space.
* a matrix 'H' with QxQ elements {H_k,l}.
H_k,l=0 if nodes 'k' and 'l' aren't joined by a edge, and H_k,l = the length of
the edge that connects these nodes.
* a matrix 'Z' with QxQ elements {Z_k,l}.
Z_k,l=0 if nodes 'k' and 'l' aren't joined by a edge, and Z_k,l = intensity_k,l
(a intensity scale of the edge, 0--
Infragistics Professional
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