Determining arrays require more than the available memory
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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.
4 Comments
M
on 10 Jan 2024
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
on 10 Jan 2024
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.
Answers (1)
Bruno Luong
on 5 Sep 2023
Just answered in another thread https://www.mathworks.com/matlabcentral/answers/2016841-available-memory-error-in-matlab-quiz?s_tid=srchtitle
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