gnuplot-py-users Mailing List for Gnuplot.py

Hi all!

I have started using gnuplot.py very recently, and my only learning has been
through 'gnuplot>help' and google>gnuplot.py.

I am trying to plot daily statistics for my utility. I have datetime objects
coming from the db alongwith other fields. I want to use the dates on the
xaxis. I tried to do something like the following:

a) extract dates from the records in the form of a list, say DL.
b) convert DL to an array: dArray = array(DL)
c) myPlot = Gnuplot.Data(dArray, anotherArray, title='x')

but it gives the following error:
*   myPlot = Gnuplot.Data(dArray, anotherArray, title='x')
**  File "/usr/lib/python2.4/site-packages/Gnuplot/PlotItems.py", line
526, in Data
    set = utils.float_array(set)
  File "/usr/lib/python2.4/site-packages/Gnuplot/utils.py", line 38, in
float_array
    return Numeric.asarray(m, Numeric.float32)
  File
"/usr/lib64/python2.4/site-packages/numpy/oldnumeric/functions.py", line
87, in asarray
    return mu.array(a, dtype, copy=0)
ValueError: setting an array element with a sequence.
*
I have ensured that the length of both the arrays are same. The only thing
which is different si that for dArray it shows dType=|S10, while for
'anotherArray' it doesnt show any dType.

Any help is much appreciated.

Thanks
Ajay

Hello all.  I have a snippet of code which seems to indicate a memory
leak when run using python 2.4 (not tested under other versions).

<===================>
import Gnuplot

x=range(0,100,1)
y=range(3,503,5)

case=1

w=Gnuplot.Gnuplot()
for iter in range(1000):
    print iter
    if case==1:
        d1=Gnuplot.Data(x,y)
    else:
        f1='/tmp/file123'
        f1h=open(f1,'w')
        for v1,v2 in zip(x,y):
            f1h.write('%s %s\n' % (v1,v2))
        f1h.close()

        d1=Gnuplot.File(f1)

raw_input()
<=====================>

When case=1, a large amount of memory is consumed (check ps or top)  I
get about 20meg and it depends on the number of iterations.  When
case!=1, the memory usage is quite small, less than 4meg and is
independent of iterations.

Obviously, the problem appears to be in the Gnuplot.Data() function,
but I have not been able to track it down.  It does not appear to be
related to the data passing type (fifo, inline, or temp files)


Andrew