any_zuhe.m

实现计算数字a选数字b的组合结果。程序机构简单

%%%%%%%%%%%%%%%%%%%%%%%%%%%本段程序实现任意数字a取6的所有组合，运行速度优先。%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%25个有        177，100
%33个数字全包有1107，568注

%马龙


tic

all=9
b=6;
c=all-b+1;
%  01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20

s=[1 2 3 4 5  6  7 8  9]


zs=(all*(all-1)*(all-2)*(all-3)*(all-4)*(all-5)) / (6*5*4*3*2) 


a=double(zeros(zs,6)) ;
 
m=1;
for i=1:c
    for j=(i+1) :(c+1)
        for k=(j+1) : (c+2)
            for x=(k+1) : (c+3)
                for y=(x+1) : (c+4)
                    for z=(y+1) : (c+5)
      a(m,1)=s(i);
      a(m,2)=s(j);
      a(m,3)=s(k);
      a(m,4)=s(x);
      a(m,5)=s(y);
      a(m,6)=s(z);
      m=m+1;
                    end
        
                end
    
            end
        end
    end
end

        

disp('所有组合数len');

len=length(a)           %所有组数