Re: [Matplotlib-users] TypeError: can't multiply sequence by non-int of type 'float'
Hi,
--- On Tue, Sep 29, 2015 at 11:59 PM, Benjamin Root
<ben.v.r...@gmail.com> wrote:
| 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.
\--
Okay.
---
| You should also declare x, y, and z as globals in that
| function so that the reassignment of those arrays persist properly.
\--
Done.
---
| 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.
\--
Done.
---
| Lastly, I implore you to use "set_data()" like in the original example,
| rather than calling plot() repeatedly.
\--
This is how the code looks like now:
=== 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
import itertools
def update_line(num, dataLines, lines):
for line, data in zip(itertools.repeat(lines, len(dataLines)), dataLines):
line.set_data(data[0:2, :num]) #
IndexError too many indices
line.set_3d_properties(data[2, :num])
return lines
def on_connect(client, userdata, flags, rc):
print("Connected with result code "+str(rc))
client.subscribe("hello/world")
def on_message(client, userdata, msg):
global x, y, z
data = msg.payload
print(msg.topic+" "+str(msg.payload))
point = np.asarray([float(element) for element in data.split()])
print point
x=np.concatenate((x,[point[0]]))
y=np.concatenate((y,[point[1]]))
z=np.concatenate((z,[point[2]]))
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])
y = np.array([4.0, 7.0, 8.0])
z = np.array([6.0, 9.0, 5.0])
data = [x, y, z]
lines, = 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=(data,
lines), interval=2000, blit=True)
plt.show()
=== END ===
So, the error now is in line.set_data where it says there are too many
indices. If I remove :num, in both line.set_data and
line.set_3d_properties, it tells me that 'TypeError': 'Line3D' is not
iterable.
Thanks for patiently answering my queries.
SK
--
Shakthi Kannan
http://www.shakthimaan.com
--
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Re: [Matplotlib-users] TypeError: can't multiply sequence by non-int of type 'float'
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
[ 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
--
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[Matplotlib-users] TypeError: can't multiply sequence by non-int of type 'float'
Hi,
I am trying to create poly lines using matplotlib and animation. My
code snippet is as follows:
=== 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
def update_line(num, x, y, z, l):
x.append(1.0)
y.append (2.0)
z.append(3.0)
print x, y, z
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')
ax.legend()
x = [1.0, 2.0, 3.0]
y = [4.0, 7.0, 8.0]
z = [6.0, 9.0, 5.0]
l, = ax.plot(x, y, z, label='Line')
line_ani = animation.FuncAnimation(fig, update_line, 25, fargs=(x, y,
z, l), interval=2000, blit=True)
plt.show()
=== END ===
The error that I get:
=== ERROR ===
$ python mat-3.py
/usr/lib/pymodules/python2.7/matplotlib/axes.py:4747: UserWarning: No
labeled objects found. Use label='...' kwarg on individual plots.
warnings.warn("No labeled objects found. "
[1.0, 2.0, 3.0, 1.0] [4.0, 7.0, 8.0, 2.0] [6.0, 9.0, 5.0, 3.0]
Exception in Tkinter callback
Traceback (most recent call last):
File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1535, in __call__
return self.func(*args)
File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 586, in callit
func(*args)
File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.py",
line 363, in idle_draw
self.draw()
File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.py",
line 348, in draw
FigureCanvasAgg.draw(self)
File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_agg.py",
line 451, in draw
self.figure.draw(self.renderer)
File "/usr/lib/pymodules/python2.7/matplotlib/artist.py", line 55,
in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/lib/pymodules/python2.7/matplotlib/figure.py", line 1034, in draw
func(*args)
File "/usr/lib/pymodules/python2.7/mpl_toolkits/mplot3d/axes3d.py",
line 270, in draw
Axes.draw(self, renderer)
File "/usr/lib/pymodules/python2.7/matplotlib/artist.py", line 55,
in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/lib/pymodules/python2.7/matplotlib/axes.py", line 2086, in draw
a.draw(renderer)
File "/usr/lib/pymodules/python2.7/mpl_toolkits/mplot3d/art3d.py",
line 117, in draw
xs, ys, zs = proj3d.proj_transform(xs3d, ys3d, zs3d, renderer.M)
File "/usr/lib/pymodules/python2.7/mpl_toolkits/mplot3d/proj3d.py",
line 194, in proj_transform
return proj_transform_vec(vec, M)
File "/usr/lib/pymodules/python2.7/mpl_toolkits/mplot3d/proj3d.py",
line 153, in proj_transform_vec
vecw = np.dot(M, vec)
TypeError: can't multiply sequence by non-int of type 'float'
[1.0, 2.0, 3.0, 1.0, 1.0] [4.0, 7.0, 8.0, 2.0, 2.0] [6.0, 9.0, 5.0, 3.0, 3.0]
Exception in Tkinter callback
Traceback (most recent call last):
File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1535, in __call__
return self.func(*args)
File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.py",
line 276, in resize
self.show()
File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.py",
line 348, in draw
FigureCanvasAgg.draw(self)
File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_agg.py",
line 451, in draw
self.figure.draw(self.renderer)
File "/usr/lib/pymodules/python2.7/matplotlib/artist.py", line 55,
in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/lib/pymodules/python2.7/matplotlib/figure.py", line 1034, in draw
func(*args)
File "/usr/lib/pymodules/python2.7/mpl_toolkits/mplot3d/axes3d.py",
line 270, in draw
Axes.draw(self, renderer)
File "/usr/lib/pymodules/python2.7/matplotlib/artist.py", line 55,
in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/lib/pymodules/python2.7/matplotlib/axes.py", line 2086, in draw
a.draw(renderer)
File "/usr/lib/pymodules/python2.7/mpl_toolkits/mplot3d/art3d.py",
line 117, in draw
xs, ys, zs = proj3d.proj_transform(xs3d, ys3d, zs3d, renderer.M)
File "/usr/lib/pymodules/python2.7/mpl_toolkits/mplot3d/proj3d.py",
line 194, in proj_transform
return proj_transform_vec(vec, M)
File "/usr/lib/pymodules/python2.7/mpl_toolkits/mplot3d/proj3d.py",
line 153, in proj_transform_vec
vecw = np.dot(M, vec)
TypeError: can't multiply sequence by non-int of type 'float'
=== END ===
I am using the basic_example.py as a template.
http://matplotlib.org/1.4.1/examples/animation/basic_example.html
What could I be missing? Appreciate any help in this regard,
Thanks!
SK
--
Shakthi Kannan
http://www.shakthimaan.com
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