Re: [Boost-users] multi_array with large dimensions crashes

Thanks very much Pierre. Is this line correct it get compile errors at this line array_ref_type::size_type xDim(500), yDim(300), zDim(400); should it be like int(300) or float(300), some thing lie that Jothy On Wed, Aug 24, 2011 at 3:51 PM, Pierre-Andre Noel < noel.pierre.andre@gmail.com> wrote:

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I am not familiar with multi_array, but it seems that you are creating a 1GB object on the stack. This will almost always crash. Try creating it on the heap instead. Be prepared for std::bad_alloc.

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But how to do this? I am new to c++.

I suggest you to either 1. read on the operators "new" and "delete" or 2. use a std::vector to allocate the memory then use a boost::multi_array_ref to refer to it. Here's an example:

#include <vector> #include

int main() { typedef float data_type; typedef std::vector array_storage_type; typedef boost::multi_array_ref array_ref_type;

array_ref_type::size_type xDim(500), yDim(300), zDim(400); array_storage_type Storage(xDim*yDim*zDim); array_ref_type Array(&Storage.front(),boost::extents[xDim][yDim][zDim]); // You may now use Array as usual. }

Hope it helps,

Pierre-André Noël

On Wed, Aug 24, 2011 at 5:20 AM, Jothy wrote:

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Thanks for pointing this out.

But how to do this? I am new to c++.

Jothy

On Tue, Aug 23, 2011 at 10:42 PM, Juraj Ivančić wrote:

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On 23.8.2011. 12:18, Jothy wrote:

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Hi all,

I have just started to use boost libs. I am trying to create a large float array (mandatory for my purpose). it works fine till certain limit, but crashes above that. I think it about allocating memory in the stack.

My code is like this

typedefboost::multi_array<**float,3>array_type; typedefarray_type::indexindex; array_typeArray(boost::**extents[xDim][yDim][zDim]);//**500,300,400 for instance

Can some one help me to resolve this?

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1GB object on the stack. This will almost always crash. Try creating it on

I am not familiar with multi_array, but it seems that you are creating a the heap instead. Be prepared for std::bad_alloc.

HTH

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