Determining arrays require more than the available memory

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Oren Savir 2023-9-5

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https://ww2.mathworks.cn/matlabcentral/answers/2016891-determining-arrays-require-more-than-the-available-memory

评论： Steven Lord 2024-1-10

how do you precisely determine if a code of array creation will exceed the limit of the computer?

after running memory function in matlab, the following results came:

maximum possible array : 9678 MB
memory available to all arrays: 9678 MB
memory used by matlab: 5705 MB
RAM: 16218 MB

Which of the following arrays require more than the available memory? (Select all that apply. - taken from Matlab Programming techniques):

x = randn(1,1e9); [Memory required: 1e9 elements * 8 bytes/element = 8 GB]
x=ones(1e4); [Memory required: 1e4 elements * 8 bytes/element = 0.08 MB]
x=zeros(1e5); [Memory required: 1e5 elements * 8 bytes/element = 0.8 MB]
x=2*randn(1,1e9); [Memory required: 1e9 elements * 8 bytes/element = 8 GB]
x= [randn(1,1e9); randn(1,1e9)]; [Memory required: 2 (number of rows) * 1e9 elements/row * 8 bytes/element = 16 GB]

I tried calculating the the amount of bytes needed for each option, but i dont seem to fully grasp this concept, as none of the option i select is correct.

thanks in advance.

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M 2024-1-10

Which of the following arrays require more than the available memory? (Select all that apply.)

x = randn(1,1e9);

x = ones(1e4);

x = zeros(1e5);

x = 2*randn(1,1e9);

x = [randn(1,1e9); randn(1,1e9)];

Steven Lord 2024-1-10

What do you think the answer is and why do you think each of those arrays would or would not require more than the available memory? If you tell us your reasoning we could confirm that you're correct or explain why you're incorrect.

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