Matlab问题,错误Incomplete or misformed expression or statement.帮

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Matlab问题,错误Incomplete or misformed expression or statement.帮帮忙啊
clear
sn=0.1;0.01:100;
snlg=20*log10(sn);
sdouble=sqrt(sn);
ssingle=sqrt(sn/2);
bdouble=Q(sdouble);
bsingle=Q(ssingle);
semilogy(snlg,bdouble);
hold;
semilogy(snlg,bsingle,'--');
axis([-20,30,0.0000001,1]);
i=1100;
while(i

第22行加多一个),改为
if(bsingle(i)
再问：这个我改过了，可是又说bsn没有定义，怎么定义呢，现在在学习中，谢谢了
再答：可能是计算bsn的条件没有满足。在第二行加bsn=[]; 试试
再问：不行哦，??? Error using ==> vertcat All rows in the bracketed expression must have the same number of columns.
再答：是哪一行出错呢？vertcat在哪里出现过？是在Q函数里？没有Q函数我也运行不了。
再问：那个是我打错了，应该是sn=0.1：0.01:100; Q函数是function y=Q(x) y=erfc(x)/sqrt(2); 帮忙运行下

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