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

Question

ime sem 2013-11-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/106429-can-you-help-me-to-calculate-the-number-of-multiplication-and-operation-we-used-flops

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

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2013-11-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/106429-can-you-help-me-to-calculate-the-number-of-multiplication-and-operation-we-used-flops#answer_115453

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