Hello Amit,
On Sunday 23 March 2008 09:54, Amit Finkler wrote:
> Hi everyone,
>
>
> I am using matplotlib to dynamically plot a graph with both my x and y
> points taken from a measurement device. That is to say, in each
> iteration of my while loop I'm reading two variables which I then want
> to plot with matplotlib.
>
>
> I wrote something which goes like this (disregard the Gnuplot - that's
> what I'm trying to replace with matplotlib...)
>
>
>
> import gpib, Numeric, time, Gnuplot, mymodule, threading
> from pylab import *
>
>
>
> def cooldown(filename, dmm_gpib, lake_gpib):
>
> """this program scans dummy and reads HP and Lakeshore"""
>
> A = Numeric.arange(-1, 1, .1)
> delay = 1
> f = open(filename,'w')
>
>
> X = []
> Y = []
> figure(2)
> hold(False)
> try:
> while A[0]<10:
>
> gpib.write(lake_fd, 'SDAT?')
> gpib.write(hp_fd, 'read?')
> time.sleep(delay)
> val1 = float(gpib.read(lake_fd, 30))
> val2 = float(gpib.read(hp_fd, 30))
> X.append(val1)
> Y.append(val2)
> plot(X,Y,'.-')
> f.write(str(val1) + '\t' + str(val2) + '\n')
> f.flush()
>
> I'm running this code in ipython with the -pylab option, so I don't need
> to use show(). My question is, how do I maintain a *constant* xlabel and
> ylabel without having to redraw them each time I append a point to the
> graph? If I try xlabel('something') then obviously it's cleared each
> time I use plot(X,Y).
I'm not sure I understand well, but if one uses xlabel("something") before the
while-loop or just after building the figure, it is not redrawn after
plotting.
regards
Matthias
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