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I can define my data structure by two different ways:

Number 1:

for i = 1:3, matrix.a{1,i} = rand(1,2000000); end
for i = 1:3, matrix.a{2,i} = rand(1,2000000); end
for i = 1:3, matrix.g{2,i} = rand(1); end
for i = 1:3, matrix.g{1,i} = rand(1); end

Number 2:

for i = 1:3, matrix2(1,i).a = rand(1,2000000); end
for i = 1:3, matrix2(2,i).a = rand(1,2000000); end
for i = 1:3, matrix2(1,i).g = rand(1); end
for i = 1:3, matrix2(2,i).g = rand(1); end

Is one of them a much more efficient way?

Thanks!

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Check whos matrix matrix2, that will show you the memory usage of both alternatives.

Without spending too much thought it should be pretty similar - it certainly is compared to the memory you need for the random numbers.

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There is no large difference, both contain 6 matrices with 2 000 000 elements, this is the important part and unchanged. You can compare execution time of the code (tic toc) and memory (whos) with this single code line x=rand(6,2000001) which obviously generates and stores the required amount of random numbers in the most efficient way. There is no significant difference.

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