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summation

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amar kshirsagar
amar kshirsagar 2011-9-28
how to implement summation in matlab Is there any function for 2D summation in matlab

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回答（2 个）

TAB
TAB 2011-9-28
A=rand(5);
As=sum(sum(A));
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Andrei Bobrov
Andrei Bobrov 2011-9-28
Hi Jan!
A= rand(5000);
tic,sum(sum(A));toc
tic,sum(A(:));toc
clear A
Elapsed time is 0.037663 seconds.
Elapsed time is 0.037902 seconds.
MATLAB R2010a, Intel Core2 Duo, 2.13 GHz, 2 GB RAM
TAB
TAB 2011-9-28
On Matlab R2007a , C2D, 4GB RAM
A= rand(5000);
tic,sum(sum(A));toc --> 0.047444 Sec
tic,sum(A(:));toc --> 0.047441 Sec
Yes, Andrei's version is faster. :-)

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Andrei Bobrov
Andrei Bobrov 2011-9-28
sum(A(:)) % A - double array 2d

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