Question

Recently, I work in C++ and I have to create a array[60.000][60.000]. However, i cannot create this array because it’s too large. I tried float **array or even static float array but nothing is good. Does anyone have an ideas?
Thanks for your helps!

Answer 1

A matrix of size 60,000 x 60,000 has 3,600,000,000 elements.

You’re using type float so it becomes:

60,000 x 60,000 * 4 bytes = 14,400,000,000 bytes ~= 13.4 GB

Do you even have that much memory in your machine?

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Note that the issue of stack vs heap doesn’t even matter unless you have enough memory to begin with.

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Here’s a list of possible problems:

• You don’t have enough memory.
• If the matrix is declared globally, you’ll exceed the maximum size of the binary.
• If the matrix is declared as a local array, then you will blow your stack.
• If you’re compiling for 32-bit, you have far exceeded the 2GB/4GB addressing limit.