4.8.2 While 循環(huán)
While 語句用于滿足一定條件的循環(huán)，語法結(jié)構(gòu)如下：
while
while expression
command group A
end
sum = 0;
k = 1;
while x(k) >= 0 & k <= length(k)
sum = sum + x(k);
k = k+1;
end
此外可以利用break命令跳出for,while循環(huán),如下例，計算MATLAB可以計算的最小正值：
>> num=0; EPS=1;
>> for num=1:1000
EPS=EPS/2;
if (1+EPS) <= 1
break
end
end
>> EPS, num
>> EPS =
1.1102e-016
>> num =
53
