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<p class="MsoNormal">Yes, unsigned int’s max is ~4GB, so it “could” work. But working with unsigned integers in the 2GB-3GB range is problematic and trick when subtraction and offsets need to be computed. It is a big red flag to me.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Another possibility, is that the program was just compiled in 32-bit mode. I don’t think a win32 application can allocate that much memory.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Brad<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Francois Budin <francois.budin@kitware.com><br>
<b>Date: </b>Monday, September 11, 2017 at 1:57 PM<br>
<b>To: </b>"Lowekamp, Bradley (NIH/NLM/LHC) [C]" <blowekamp@mail.nih.gov><br>
<b>Cc: </b>Fabian Torres <fabian.trobles@gmail.com>, "insight-users@itk.org" <insight-users@itk.org><br>
<b>Subject: </b>Re: [ITK-users] Variable Matrix Access Violiotation<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in">@Brad: I looked in the source code and the types of the column and row size variables are "unsigned int" which should allow up to 2^32-1 so 4GB, isn't that correct?<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in">On Mon, Sep 11, 2017 at 1:47 PM, Lowekamp, Bradley (NIH/NLM/LHC) [C] <<a href="mailto:blowekamp@mail.nih.gov" target="_blank">blowekamp@mail.nih.gov</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
Oh! I think you are experiencing integer overflow with that size of a matrix. The value Francois (correctly) computed 3,200,000,000 is ~3GB which is greater than numeric_traits<int>::max(), which for 32-bit singed integers is 2,147,483,647. The internal implementation
of this class is vnl_matrix, so the integer limitation lies within that library. So you matrix is too big for this library.<o:p></o:p></p>
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<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
When I looked at this e-mail earlier I miss computed the size, so I didn’t realized this problem.<o:p></o:p></p>
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<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
HTH,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
Brad<o:p></o:p></p>
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<o:p></o:p></p>
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<b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Francois Budin <<a href="mailto:francois.budin@kitware.com" target="_blank">francois.budin@kitware.com</a>><br>
<b>Date: </b>Monday, September 11, 2017 at 1:38 PM<br>
<b>To: </b>Fabian Torres <<a href="mailto:fabian.trobles@gmail.com" target="_blank">fabian.trobles@gmail.com</a>><br>
<b>Cc: </b>"<a href="mailto:insight-users@itk.org" target="_blank">insight-users@itk.org</a>" <<a href="mailto:insight-users@itk.org" target="_blank">insight-users@itk.org</a>><br>
<b>Subject: </b>Re: [ITK-users] Variable Matrix Access Violiotation</span><o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt;margin-left:1.0in">
Hello Fabian,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in">
You are most likely allocating more memory than what your computer can allocates. If you compute the memory required for your matrix, it will be at least:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt;margin-left:1.0in">
8 (long doubles on Visual Studio C++ are the same size as doubles) * 2*100*100*2*100*100 = 3 200 000 000 Bytes<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in">
This means that you need to have at least that much memory available.<o:p></o:p></p>
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If your computer does not have this amount of memory available, you will run into errors.<o:p></o:p></p>
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Hope this helps,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in">
Francois<o:p></o:p></p>
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<o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in">
On Wed, Aug 30, 2017 at 12:24 PM, Fabian Torres <<a href="mailto:fabian.trobles@gmail.com" target="_blank">fabian.trobles@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in">
Hi evryone. <o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in">
I´m using itk VariableMatrix to do some image processing. But I have some problems initializing my matrices.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in">
When I use small sizes like this I do not have any problem<o:p></o:p></p>
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<o:p></o:p></p>
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//matrix A<o:p></o:p></p>
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regionSize[0] = 15;<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in">
regionSze[1] = 15;<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in">
VariableSizeMatrix<long double> matA;<o:p></o:p></p>
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matA.SetSize(2*regionSize[0]*regionSize[1],2*regionSize[0]*regionSize[1]);<o:p></o:p></p>
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matA.Fill(0.0);<o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in">
But when I use bigger sizes like:<o:p></o:p></p>
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<o:p></o:p></p>
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regionSize[0] = 100;<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in">
regionSze[1] = 100;<o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in">
I get an Acces Violation exception<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in">
Access violation reading location 0xcdcdcdc1.<o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in">
I'm using Visualstudio 2008 and ITK 4.4<o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in">
Does this has something to do with memory allocation?<o:p></o:p></p>
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Is there a way a could verify if I have enough memory to allocate my matrix?<o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in">
Thanks.<o:p></o:p></p>
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<span style="color:#888888"> </span><o:p></o:p></p>
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<span class="m-7819910353623902563hoenzb"><span style="color:#888888">-- </span></span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in">
<span style="color:#888888">Fabián Torres Robles<br>
Maestría en Ciencias en Ingeniería Electrónica<br>
Ingeniería en Sistemas Electrónicos<br>
Tel. 58081280, 0445534661338<br>
E-mail <a href="mailto:fabian.trobles@gmail.com" target="_blank">fabian.trobles@gmail.com</a>,
<a href="mailto:dae.wong@gmail.com" target="_blank">dae.wong@gmail.com</a> </span>
<o:p></o:p></p>
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