matplotlib-users Mailing List for matplotlib

>>>>> "John" == John Hunter <jdh...@ac...> writes:
 John> If you want to use technique with bar, hist, or scatter
 John> (which return Patch instances), you'll have to wait a few
 John> minutes while I update the code, because I haven't added a
 John> set data method for those classes.
I added some features to CVS to make this work with patches and do
allow the updates to occur flicker free. Below is an simulated
example that uses a bar chart to show network, CPU and memory usage,
updating 4 times per second. If you have trouble with CVS or want a
windows installer of the updated code, let me know
John Hunter
[ I'm reposting this because it didn't seem to get through yesterday.
If this is a duplicate sorry ]
import pygtk
pygtk.require('2.0')
import gtk
import time
from matplotlib.matlab import *
def get_memory():
 "Simulate a function that returns system memory"
 return 100*(1+sin(0.5*pi*time.time()))
def get_cpu():
 "Simulate a function that returns cpu usage"
 return 100*(1+sin(0.2*pi*(time.time()-0.25)))
def get_net():
 "Simulate a function that returns network bandwidth"
 return 100*(1+sin(0.7*pi*(time.time()-0.1)))
def get_stats():
 return get_memory(), get_cpu(), get_net()
fig = figure(1)
ax = subplot(111)
ind = arange(1,4)
pm, pc, pn = bar(ind, get_stats())
centers = ind + 0.5*pm.get_width()
pm.set_facecolor('r')
pc.set_facecolor('g')
pn.set_facecolor('b')
ax.set_xlim([0.5,4])
ax.set_xticks(centers)
ax.set_ylim([0,100])
ax.set_xticklabels(['Memory', 'CPU', 'Bandwidth'])
ax.set_ylabel('Percent usage')
ax.set_title('System Monitor')
def updatefig(*args):
 m,c,n = get_stats()
 pm.set_height(m)
 pc.set_height(c)
 pn.set_height(n)
 ax.set_ylim([0,100])
 fig.draw()
 
 return gtk.TRUE
gtk.timeout_add(250, updatefig)
show()
 
John Hunter

 Golawala> Hi, I just discovered the matplotlib.matlab
 Golawala> libraries. I am trying to create a dynamic graph using
 Golawala> this library. So far I am only able to create a static
 Golawala> view of the grap. Is is possible to create a graph that
 Golawala> is dynamic? (Example: in windows if you select task
 Golawala> manager you get a graph that shows you dynamic
 Golawala> information about the CPU and Memory Usage history.) I
 Golawala> just want to repaint the graph rather than closing it
 Golawala> and re-showing it.
Yes, this is possible. The two key ingredients are 1) the use of the
gtk.timeout_add function which will repeatedly call a function of your
choice and 2) call the relevant axis/line/patch methods to update your
figure.
Here is an example, that resets the x and y data of the plot every
1000 milliseconds
 import pygtk
 pygtk.require('2.0')
 import gtk
 from matplotlib.matlab import *
 fig = figure(1)
 ind = arange(30)
 X = rand(len(ind),10)
 lines = plot(X[:,0], 'o')
 def updatefig(*args):
 lines[0].set_data(ind, X[:,updatefig.count])
 fig.draw()
 updatefig.count += 1
 if updatefig.count<10: return gtk.TRUE
 else: return gtk.FALSE
 updatefig.count = 0
 gtk.timeout_add(1000, updatefig)
 show()
The timeout_add function will only keep calling your method as long as
you return gtk.TRUE. So in the example above, I return False after
the 10 columns of my random matrix X are plotted.
You can control other attributes of the line in a similar way, eg, by
calling set_color, set_linewidth, etc....
If you want to use technique with bar, hist, or scatter (which return
Patch instances), you'll have to wait a few minutes while I update the
code, because I haven't added a set data method for those classes.
John Hunter

Hi,
I just discovered the matplotlib.matlab libraries. I am trying to create =
a dynamic graph using this library. So far I am only able to create a =
static view of the grap. Is is possible to create a graph that is =
dynamic? (Example: in windows if you select task manager you get a graph =
that shows you dynamic information about the CPU and Memory Usage =
history.) I just want to repaint the graph rather than closing it and =
re-showing it.=20
Any help appreciated. Thanks
> Regards,
> Moiz Golawala
> Casi-Rusco, a GE Interlogix Company
> 791 Park Of Commerce Blvd., Boca Raton, FL 33487 *
> moi...@ca... *
> 561-912-5972 * 561-912-1650 *
>=20
>=20