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

function i = pdga()
n=46;

    factors = factor(n);
    if length(factors) == 1
      i = 1;
    else
      i = prod(factors(2:end));

    end
  end

Answer 1

[Walter Roberson]

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