Hi all,
I tried to plot parts of a large 3D array with each 4 float64 entries.
Loading the array with numpy.fromfile and performing a type conversion
afterwards ends up in a MemoryError.
The following code reproduces the error:
***********************************
import gc
from os import path
from numpy import zeros, empty, float32, float64, fromfile
# With the imports of the next three lines a memory error occurs
#import matplotlib
#matplotlib.use("AGG")
#import matplotlib.pylab as plt
_filename = "mt.dat"
if (path.exists(_filename)==False):
print "Write file ..."
_mtf = file(_filename, "wb")
_mtd = zeros( (300,300,300,4),dtype=float64)
_mtd.tofile(_mtf)
_mtf.close()
_mtd = empty((0))
gc.collect();
print "Try to read file ..."
_mtf = file(_filename, "rb")
# The memory error occurs with the type conversion to float 64,
# but only if mathplotlib is imported!
_mtd = fromfile(_mtf,float64).astype(float32)
_mtf.close()
print "Successful read:",_mtd.shape
# Here some plot stuff would be :)
***********************************
If the import of matplotlib is not included, no error occures otherwise it
will not work. Perhaps anybody can help me (I tested it only on a Windows XP
32Bit).
Best regards and thank you
Stefan
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