can you help me to calculate the number of multiplication and operation ,we used flops,

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ime sem
ime sem 2013-11-16
编辑： Walter Roberson 2014-1-21
function i = pdga()
n=46;
factors = factor(n);
if length(factors) == 1
i = 1;
else
i = prod(factors(2:end));
end
end

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Walter Roberson
Walter Roberson 2013-11-16
Sorry, no, on modern systems is not not possible to meaningfully calculate FLOPS.
http://www.mathworks.com/matlabcentral/newsreader/view_thread/161008
http://www.mathworks.com/matlabcentral/answers/51687
http://www.mathworks.com/matlabcentral/answers/5703
http://www.mathworks.com/matlabcentral/answers/12508
Also, the method that factor() uses to determine the factors is not documented. You could peak at the source code for MATLAB's factor(), but keep in mind that that code is one possible implementation and not necessarily the most efficient implementation. It is not known what the most efficient possible factorization is; see http://en.wikipedia.org/wiki/Integer_factorization#Difficulty_and_complexity

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