How to declare large array size?

[kalaiarasi]

Hi all,

Is it possible to declare large sized array?

double array[76800][76800];

I'm getting out of memory error.
My RAM is 64MB.

any other way of doing this?


Kalai.

 

[jtm111]

yes there is another way, allocate the array dynamically at run time.

double **array;
int rows = 76800;
int cols = 76800;

// array of pointers to rows
array = new double *[rows];

// allocate each row to column number
for (int i = 0; i < rows; i++)
{
array = new double[cols];
}


// cleanup: delete row arrays
for (i = 0; i < rows; i++)
{
delete [] array;
}

// cleanup: delete array of row pointers and you're done
delete [] array;

 

[tchouch]

Your array needs 47 GB memory - do You have so much on Your PC at all?

 

[kalaiarasi]

nope.. i dont.. no way of doing it huh?

 

[jtm111]

It all depends on what your application is doing. Is double precision needed? Is the matrix fully populated or is it sparse?