MathGroup Archive 2011

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Memory when reding in data

  • To: mathgroup at
  • Subject: [mg120990] Re: Memory when reding in data
  • From: "Scot T. Martin" <smartin at>
  • Date: Sat, 20 Aug 2011 06:18:31 -0400 (EDT)
  • Delivered-to:
  • References: <>

When you don't need Mathematica to remember anything for In[..] and Out[..] functionality, set $HistoryLength, e.g., default value is Infinity. If you really don't need the In/Out functionality, use $HistoryLength = 1.
From: Peter Rodenbach [peter.rodenbach at]
Sent: Friday, August 19, 2011 06:34
To: mathgroup at
Subject: [mg120990] Memory when reding in data

Hi everyone.

I am analysing image data and I have the problem that after about 50
images or so Mathematica quits the calculation with the hint out of
memory. The interesting part of the code i wrote is :

(*Import the first image into Maxvals, which will be compared to all \
other images and overwritten if any point is found to be larger*)


Initialise = OpenRead["s2_260_0000.edf", BinaryFormat -> True];
MaxValues =
   Table["UnsignedInteger16", {512}, {512}]];
counter = Dimensions[MaxValues];

(*Load all experimental images and perform maximum projection*)

MaxProjection[filename_] := {OpenRead[filename, BinaryFormat -> True],
   Imagevalues =
   BinaryRead[filename, Table["UnsignedInteger16", {512}, {512}]],
  For[i = 1, i <= counter[[1]], i++,
        For [j = 1, j <= counter[[2]], j++,
    If[MaxValues[[i, j]] >= Imagevalues[[i, j]],
     MaxValues[[i, j]] = MaxValues[[i, j]],
     MaxValues[[i, j]] = Imagevalues[[i, j]]]
   ], Close[Imagevalues]}

MaxProjection[#] & /@ FileNames@"*edf"

So I guess Mathm saves all the data of all the images after each
other. But once the comparision is done with the one MaxProjection
Image I want to have, all the data can be dumped from the memory and
then the next image can be compared with this MaxProjection image.

Does anyone have an idea? Thx.

  • Prev by Date: Re: SameQ to check for simplified radical expressions... doesn't work
  • Next by Date: copying Inline math to create StandardForm in Input cell
  • Previous by thread: Memory when reding in data
  • Next by thread: Re: Memory when reding in data