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Taking a tiny part of a huge matrix still matters to calculaltion time ?

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Jeon
Jeon 2013-8-12
关闭： MATLAB Answer Bot 2021-8-20
Say I have a matrix 'A' sized 10000 x 1000
But I just use A(1:10, 1:10) for a certain purpose.
Of course, it takes shorter time than A(:, :)
But, is it slower significatly than when use matrix B sized 10 x 10 ?
size(A)
ans = 10000 10000
tic
some_calculation( A(1:10, 1:10) );
toc
size(B)
ans = 10 10
tic
some_calculation( B(1:10, 1:10) );
toc

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per isakson
per isakson 2013-8-12
Because the sub-matrix is not in a contiguous piece of memory.

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