<div dir="ltr"><p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span style="font-size:12pt;font-family:Arial,sans-serif;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial">Hi.</span><span style="font-size:12pt;font-family:"Times New Roman",serif"><span></span></span></p>
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<p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span style="font-size:12pt;font-family:Arial,sans-serif">Thanks for your responses;
all of them gave me some perspective on the problem.<span></span></span></p>
<p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span style="font-size:12pt;font-family:Arial,sans-serif">Indeed the size of my
matrix is around 3GB and I do have enough memory space to allocate it.<span></span></span></p>
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<p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span style="font-size:12pt;font-family:Arial,sans-serif">So I think the problem
lies in the integer overflow and that my program is compiled in 32-bit mode, so
my win32 cannot allocate that size of matrix.<span></span></span></p>
<p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span style="font-size:12pt;font-family:Arial,sans-serif"><span> </span></span></p>
<p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span style="font-size:12pt;font-family:Arial,sans-serif">So what do you recommend?
use another kind of structure that it is not an itk matrix and compiling this
project in 64bits?<span></span></span></p>
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<p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span style="font-size:12pt;font-family:Arial,sans-serif">Thank you very much. I
do appreciate the time you took for this subject.<span></span></span></p></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Sep 11, 2017 at 1:08 PM, Lowekamp, Bradley (NIH/NLM/LHC) [C] <span dir="ltr"><<a href="mailto:blowekamp@mail.nih.gov" target="_blank">blowekamp@mail.nih.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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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.<u></u><u></u></p>
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<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.<u></u><u></u></p>
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<p class="MsoNormal">Brad<u></u><u></u></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 <<a href="mailto:francois.budin@kitware.com" target="_blank">francois.budin@kitware.com</a>><br>
<b>Date: </b>Monday, September 11, 2017 at 1:57 PM<br>
<b>To: </b>"Lowekamp, Bradley (NIH/NLM/LHC) [C]" <<a href="mailto:blowekamp@mail.nih.gov" target="_blank">blowekamp@mail.nih.gov</a>><br>
<b>Cc: </b>Fabian Torres <<a href="mailto:fabian.trobles@gmail.com" target="_blank">fabian.trobles@gmail.com</a>>, "<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>></span></p><div><div class="h5"><br>
<b>Subject: </b>Re: [ITK-users] Variable Matrix Access Violiotation<u></u><u></u></div></div><p></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?<u></u><u></u></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:<u></u><u></u></p>
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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.<u></u><u></u></p>
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<u></u><u></u></p>
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When I looked at this e-mail earlier I miss computed the size, so I didn’t realized this problem.<u></u><u></u></p>
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<u></u><u></u></p>
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HTH,<u></u><u></u></p>
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Brad<u></u><u></u></p>
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<u></u><u></u></p>
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<u></u><u></u></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><u></u><u></u></p>
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<u></u><u></u></p>
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Hello Fabian,<u></u><u></u></p>
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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:<u></u><u></u></p>
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8 (long doubles on Visual Studio C++ are the same size as doubles) * 2*100*100*2*100*100 = 3 200 000 000 Bytes<u></u><u></u></p>
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This means that you need to have at least that much memory available.<u></u><u></u></p>
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If your computer does not have this amount of memory available, you will run into errors.<u></u><u></u></p>
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Hope this helps,<u></u><u></u></p>
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Francois<u></u><u></u></p>
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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:<u></u><u></u></p>
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Hi evryone. <u></u><u></u></p>
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<u></u><u></u></p>
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I´m using itk VariableMatrix to do some image processing. But I have some problems initializing my matrices.<u></u><u></u></p>
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When I use small sizes like this I do not have any problem<u></u><u></u></p>
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//matrix A<u></u><u></u></p>
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regionSize[0] = 15;<u></u><u></u></p>
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regionSze[1] = 15;<u></u><u></u></p>
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VariableSizeMatrix<long double> matA;<u></u><u></u></p>
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matA.SetSize(2*regionSize[0]*<wbr>regionSize[1],2*regionSize[0]*<wbr>regionSize[1]);<u></u><u></u></p>
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matA.Fill(0.0);<u></u><u></u></p>
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<u></u><u></u></p>
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But when I use bigger sizes like:<u></u><u></u></p>
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regionSize[0] = 100;<u></u><u></u></p>
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regionSze[1] = 100;<u></u><u></u></p>
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<u></u><u></u></p>
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I get an Acces Violation exception<u></u><u></u></p>
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Access violation reading location 0xcdcdcdc1.<u></u><u></u></p>
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<u></u><u></u></p>
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I'm using Visualstudio 2008 and ITK 4.4<u></u><u></u></p>
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Does this has something to do with memory allocation?<u></u><u></u></p>
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Is there a way a could verify if I have enough memory to allocate my matrix?<u></u><u></u></p>
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<u></u><u></u></p>
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Thanks.<u></u><u></u></p>
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<span style="color:#888888"> </span><u></u><u></u></p>
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<span class="m_-8487906454607124523m-7819910353623902563hoenzb"><span style="color:#888888">-- </span></span><u></u><u></u></p>
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<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>
<u></u><u></u></p>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>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> <div style="padding:0px;margin-left:0px;margin-top:0px;overflow:hidden;word-wrap:break-word;color:black;font-size:10px;text-align:left;line-height:130%"></div><div style="padding:0px;margin-left:0px;margin-top:0px;overflow:hidden;word-wrap:break-word;color:black;font-size:10px;text-align:left;line-height:130%"></div></div></div></div>
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