matplotlib-users Mailing List for matplotlib

Sorry for bother, not sure if this goes through or not.

I had a plot with hatch in it. But the default linewidth for hatch makes it
really hard to see in my current figure layout/scale, so I would like to
increases the hatch linewidth;

plt.bar(ind, s1[:,3],width, color='0.85', edgecolor='black',
linewidth=[0.5],hatch='-----//////')

The linewidth there can only change the width of the edge, but not the
hatch width;


I did several google searches with no solution. But I indeed noticed that
several years ago (back to year 2011), this is impossible as the hatch
linewidth is hard coded as:

hatch_path_stroke.width(1.0);


But is this implemented so that I can change the hatch linewidth?

Best regards

Luis

You have some logic issues here. First off, I wouldn't be updating the plot
in the same function that is updating the data values. Assuming that
"loop_start()" is asynchronous, the update frequency for it is likely to be
entirely different from the Animation update frequency. So, just have that
function do updates. You should also declare x, y, and z as globals in that
function so that the reassignment of those arrays persist properly.


Your list comprehension prior to concatenating uses a variable "x", which
is likely causing the current error that you see. Change that name to
something else.

Lastly, I implore you to use "set_data()" like in the original example,
rather than calling plot() repeatedly.

Cheers!
Ben Root


On Tue, Sep 29, 2015 at 2:05 PM, Shakthi Kannan <sha...@gm...>
wrote:

> Hi,
>
> I was able to get past the error, and I am now trying to add a
> callback to receive values from a queue, add it to the existing poly
> line, and render the same using matplotlib. The code snippet is shown
> below:
>
> === BEGIN ===
>
> import matplotlib as mpl
> from mpl_toolkits.mplot3d import Axes3D
> import numpy as np
> import matplotlib.pyplot as plt
> import matplotlib.animation as animation
> import sys
> import paho.mqtt.client as mqtt
>
> def update_line(num, x, y, z, l):
>     print x, y, z
>     l, = ax.plot(x, y, z, label='Line')
>     return l,
>
> def on_connect(client, userdata, flags, rc):
>     print("Connected with result code "+str(rc))
>     client.subscribe("hello/world")
>
> def on_message(client, userdata, msg):
>     data = msg.payload
>     print(msg.topic+" "+str(msg.payload))
>     point = np.asarray([float(x) for x in data.split()])
>     print point
>     x=np.concatenate((x,[point[0]]))
>     y=np.concatenate((y,[point[1]]))
>     z=np.concatenate((z,[point[2]]))
>     l, = ax.plot(x, y, z, label='Line')
>     return l,
>
> fig = plt.figure()
> ax = fig.gca(projection='3d')
> ax.set_xlabel('X')
> ax.set_ylabel('Y')
> ax.set_zlabel('Z')
>
> x = np.array([1.0, 2.0, 3.0])
> print type(x)
> y = np.array([4.0, 7.0, 8.0])
> z = np.array([6.0, 9.0, 5.0])
>
> l, = ax.plot(x, y, z, label='Line')
> ax.legend()
>
> client = mqtt.Client()
> client.on_connect = on_connect
> client.on_message = on_message
> client.connect_async("localhost", 1883, 60)
> client.loop_start()
>
> line_ani = animation.FuncAnimation(fig, update_line, 25, fargs=(x, y,
> z, l), interval=2000, blit=True)
>
> plt.show()
>
> === END ===
>
> I now hit the following error:
>
> === ERROR ===
>
>  $ python mat-3.py
> <type 'numpy.ndarray'>
> [ 1.  2.  3.] [ 4.  7.  8.] [ 6.  9.  5.]
>  Connected with result code 0
> [ 1.  2.  3.] [ 4.  7.  8.] [ 6.  9.  5.]
> [ 1.  2.  3.] [ 4.  7.  8.] [ 6.  9.  5.]
> [ 1.  2.  3.] [ 4.  7.  8.] [ 6.  9.  5.]
> hello/world 34.56 15.912 0.72
> [ 34.56   15.912   0.72 ]
> Exception in thread Thread-1:
> Traceback (most recent call last):
>   File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
>     self.run()
>   File "/usr/lib/python2.7/threading.py", line 763, in run
>     self.__target(*self.__args, **self.__kwargs)
>   File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py",
> line 2287, in _thread_main
>     self.loop_forever()
>   File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py",
> line 1261, in loop_forever
>     rc = self.loop(timeout, max_packets)
>   File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py",
> line 811, in loop
>     rc = self.loop_read(max_packets)
>   File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py",
> line 1073, in loop_read
>     rc = self._packet_read()
>   File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py",
> line 1475, in _packet_read
>     rc = self._packet_handle()
>   File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py",
> line 1943, in _packet_handle
>     return self._handle_publish()
>   File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py",
> line 2118, in _handle_publish
>     self._handle_on_message(message)
>   File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py",
> line 2274, in _handle_on_message
>     self.on_message(self, self._userdata, message)
>   File "mat-3.py", line 23, in on_message
>     x=np.concatenate((x,[point[0]]))
> ValueError: zero-dimensional arrays cannot be concatenated
>
> [ 1.  2.  3.] [ 4.  7.  8.] [ 6.  9.  5.]
> [ 1.  2.  3.] [ 4.  7.  8.] [ 6.  9.  5.]
> [ 1.  2.  3.] [ 4.  7.  8.] [ 6.  9.  5.]
>
> ...
>
> === END ===
>
> Is there a better way to re-render the plot after receiving data?
>
> Thanks!
>
> SK
>
> --
> Shakthi Kannan
> http://www.shakthimaan.com
>
>
> ------------------------------------------------------------------------------
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>

Hi,

I was able to get past the error, and I am now trying to add a
callback to receive values from a queue, add it to the existing poly
line, and render the same using matplotlib. The code snippet is shown
below:

=== BEGIN ===

import matplotlib as mpl
from mpl_toolkits.mplot3d import Axes3D
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation
import sys
import paho.mqtt.client as mqtt

def update_line(num, x, y, z, l):
    print x, y, z
    l, = ax.plot(x, y, z, label='Line')
    return l,

def on_connect(client, userdata, flags, rc):
    print("Connected with result code "+str(rc))
    client.subscribe("hello/world")

def on_message(client, userdata, msg):
    data = msg.payload
    print(msg.topic+" "+str(msg.payload))
    point = np.asarray([float(x) for x in data.split()])
    print point
    x=np.concatenate((x,[point[0]]))
    y=np.concatenate((y,[point[1]]))
    z=np.concatenate((z,[point[2]]))
    l, = ax.plot(x, y, z, label='Line')
    return l,

fig = plt.figure()
ax = fig.gca(projection='3d')
ax.set_xlabel('X')
ax.set_ylabel('Y')
ax.set_zlabel('Z')

x = np.array([1.0, 2.0, 3.0])
print type(x)
y = np.array([4.0, 7.0, 8.0])
z = np.array([6.0, 9.0, 5.0])

l, = ax.plot(x, y, z, label='Line')
ax.legend()

client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.connect_async("localhost", 1883, 60)
client.loop_start()

line_ani = animation.FuncAnimation(fig, update_line, 25, fargs=(x, y,
z, l), interval=2000, blit=True)

plt.show()

=== END ===

I now hit the following error:

=== ERROR ===

 $ python mat-3.py
<type 'numpy.ndarray'>
[ 1.  2.  3.] [ 4.  7.  8.] [ 6.  9.  5.]
 Connected with result code 0
[ 1.  2.  3.] [ 4.  7.  8.] [ 6.  9.  5.]
[ 1.  2.  3.] [ 4.  7.  8.] [ 6.  9.  5.]
[ 1.  2.  3.] [ 4.  7.  8.] [ 6.  9.  5.]
hello/world 34.56 15.912 0.72
[ 34.56   15.912   0.72 ]
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 763, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py",
line 2287, in _thread_main
    self.loop_forever()
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py",
line 1261, in loop_forever
    rc = self.loop(timeout, max_packets)
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py",
line 811, in loop
    rc = self.loop_read(max_packets)
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py",
line 1073, in loop_read
    rc = self._packet_read()
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py",
line 1475, in _packet_read
    rc = self._packet_handle()
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py",
line 1943, in _packet_handle
    return self._handle_publish()
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py",
line 2118, in _handle_publish
    self._handle_on_message(message)
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py",
line 2274, in _handle_on_message
    self.on_message(self, self._userdata, message)
  File "mat-3.py", line 23, in on_message
    x=np.concatenate((x,[point[0]]))
ValueError: zero-dimensional arrays cannot be concatenated

[ 1.  2.  3.] [ 4.  7.  8.] [ 6.  9.  5.]
[ 1.  2.  3.] [ 4.  7.  8.] [ 6.  9.  5.]
[ 1.  2.  3.] [ 4.  7.  8.] [ 6.  9.  5.]

...

=== END ===

Is there a better way to re-render the plot after receiving data?

Thanks!

SK

-- 
Shakthi Kannan
http://www.shakthimaan.com

Thanks in advance but Sorry to bother those who are not interested.

I had a plot with hatch in it. But the default linewidth for hatch makes it
really hard to see in my current figure layout/scale, so I would like to
increases the hatch linewidth;

plt.bar(ind, s1[:,3],width, color='0.85', edgecolor='black',
linewidth=[0.5],hatch='-----//////')

The linewidth there can only change the width of the edge, but not the
hatch width;


I did several google searches with no solution. But I indeed noticed that
several years ago (back to year 2011), this is impossible as the hatch
linewidth is hard coded as:

hatch_path_stroke.width(1.0);


But is this implemented so that I can change the hatch linewidth?

Best regards

Luis