[Numpy-discussion] matplotlib and numpy cause MemoryError

Mathew Yeates mat.yeates@gmail....
Wed Nov 18 16:22:59 CST 2009


also, the exception is only thrown when I plot something first. I wonder if
matplotlib is messing something up.

On Wed, Nov 18, 2009 at 2:13 PM, Mathew Yeates <mat.yeates@gmail.com> wrote:

> The value of dims is constant and not particularly large. I also checked to
> make sure I wasn't running out of memory. Are there other reasons for this
> error?
>
> Mathew
>
>
> On Wed, Nov 18, 2009 at 1:51 PM, Robert Kern <robert.kern@gmail.com>wrote:
>
>> On Wed, Nov 18, 2009 at 15:48, Mathew Yeates <mat.yeates@gmail.com>
>> wrote:
>> > Hi
>> >
>> > I have a line of matplotlib code
>> >
>> > -self.ax.plot(plot_data,mif)
>> >
>> >
>> >
>> > that causes the line
>> >
>> > -self.data=numpy.zeros(shape=dims)
>> >
>> >
>> >
>> > to throw a MemoryError exception.
>> >
>> > (if I comment out the first line I get no error.)
>> >
>> > This is on a windows xp machine with latest numpy and the latest
>> matplotlib.
>> >
>> >
>> >
>> > I have a feeling this may be a nightmare to figure out what matplotlib
>> > and/or numpy are doing wrong. Any ideas where I can start?
>>
>> Print out dims just before the second line to make sure that it is
>> reasonable. A MemoryError is raised when numpy cannot allocate enough
>> memory on your system. If dims is too large for some reason, you could
>> run into that limit. It might be because what you are trying to plot
>> is simply too large or there might possibly (but unlikely) be a bug
>> that is miscalculating dims.
>>
>> --
>> Robert Kern
>>
>> "I have come to believe that the whole world is an enigma, a harmless
>> enigma that is made terrible by our own mad attempt to interpret it as
>> though it had an underlying truth."
>>  -- Umberto Eco
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>>
>
>
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