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cw277

木虫 (正式写手)

[求助] 求助,请看一个matlab程序~~

看有没有什么地方可以优化?

clear all;
fp=fopen('c:\\1.txt','w');
tic
min=6;
num=0;
for i=1:500
l=GETBIT(i,0) + GETBIT(i,1)*sym('x1') + GETBIT(i,2)*sym('x2') + GETBIT(i,3)*sym('x3') + GETBIT(i,4)*sym('x4') + GETBIT(i,5)*sym('x5') + GETBIT(i,6)*sym('x6') + GETBIT(i,7)*sym('x7') + GETBIT(i,8)*sym('x1*x2') + GETBIT(i,9)*sym('x1*x3') + GETBIT(i,10)*sym('x1*x4') + GETBIT(i,11)*sym('x1*x5') + GETBIT(i,12)*sym('x1*x6') + GETBIT(i,13)*sym('x1*x7') + GETBIT(i,14)*sym('x2*x3') + GETBIT(i,15)*sym('x2*x4') + GETBIT(i,16)*sym('x2*x5') + GETBIT(i,17)*sym('x2*x6') + GETBIT(i,18)*sym('x2*x7') + GETBIT(i,19)*sym('x3*x4') + GETBIT(i,20)*sym('x3*x5') + GETBIT(i,21)*sym('x3*x6') + GETBIT(i,22)*sym('x3*x7') + GETBIT(i,23)*sym('x4*x5') + GETBIT(i,24)*sym('x4*x6') + GETBIT(i,25)*sym('x4*x7') + GETBIT(i,26)*sym('x5*x6') + GETBIT(i,27)*sym('x5*x7') + GETBIT(i,28)*sym('x6*x7') ;
f=sym(' x1 + x1*x3+ x2*x3+x4 + x1*x4 + x2*x4 + x1*x2*x4 + x3*x4 + x1*x3*x4 + x1*x2*x3*x4 + x1*x3*x5 + x4*x5 + x1*x2*x4*x5 + x1*x2*x3*x4*x5 + x6 + x2*x6 + x1*x2*x6 + x1*x2*x3*x6 + x1*x2*x4*x6 + x1*x2*x3*x4*x6 + x1*x5*x6 + x3*x5*x6 + x1*x4*x5*x6 + x3*x4*x5*x6 + x7 + x2*x7 + x1*x2*x7 + x2*x3*x7 + x1*x4*x7+ x1*x2*x4*x7+ x1*x2*x3*x4*x7 +x5*x7 +x1*x5*x7 +x1*x3*x5*x7 +x1*x2*x3*x5*x7 +x2*x4*x5*x7 +x2*x3*x4*x5*x7 +x6*x7 +x1*x2*x6*x7 +x1*x3*x6*x7 +x1*x2*x3*x6*x7 +x2*x4*x6*x7 +x1*x3*x4*x6*x7 +x2*x3*x4*x6*x7 +x5*x6*x7 +x2*x5*x6*x7 +x1*x2*x5*x6*x7 +x2*x3*x5*x6*x7 +x1*x4*x5*x6*x7 +x3*x4*x5*x6*x7');
s=char(expand(l*f));
s=strrep(s,'^2','');
s=strrep(s,' 2*',' 0*');
s=strrep(s,' 4*',' 0*');
s=strrep(s,' 6*',' 0*');
s=strrep(s,' 8*',' 0*');
s=char(expand(sym(s)));
s=strrep(s,' 2*',' 0*');
s=strrep(s,' 4*',' 0*');
s=strrep(s,' 6*',' 0*');
s=strrep(s,' 8*',' 0*');
s=strrep(s,' 10*',' 0*');
s=char(expand(sym(s)));
s=strrep(s,'x1','x');
s=strrep(s,'x2','x');
s=strrep(s,'x3','x');
s=strrep(s,'x4','x');
s=strrep(s,'x5','x');
s=strrep(s,'x6','x');
s1=strrep(s,'x7','x');
fprintf(fp,'%d\r\n',i);
if(poly_degree(s1)<=min&poly_degree(s1)>0)
    min=poly_degree(s1);
    num=i;
end
end
fprintf(fp,'%d,%d\r\n',min,num);
fclose(fp);
toc;
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感谢生活让我慢慢学会控制自己的情绪,学会包容与忍耐,学会不再去期待
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l_ck

银虫 (正式写手)

1.txt 里面装的是什么?
an eye in me soup~
3楼2012-10-08 13:39:47
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查看全部 3 个回答

Toauto

至尊木虫 (著名写手)

【答案】应助回帖

★ ★ ★ ★ ★ ★ ★
感谢参与,应助指数 +1
cw277: 金币+2, 有帮助, 那我就定义一些变量替换它们。 2012-10-10 09:49:03
cw277: 金币+5, 有帮助 2012-10-18 10:35:23
xzhdty: 谢谢 2012-10-18 12:51:04
把sym('####')这些都放到for循环前面去吧?要不然每次循环都要建立变量、开辟空间,就慢了
low-key
2楼2012-10-08 12:04:58
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