matlab 不支持 if 判断后面加 区间！！！

本人程序：

if   0<= a<= 8
    x=0;
else
    x=1;
end

结果总是不对，原来  0<= a<8  的写法是错的，而应该修改为：

​
if   (0<=a) && (a<8)
    x=0;
else
    x=1;
end

​

官方文件：

Explanation

MATLAB does not support testing whether y is in between x and z with this syntax.

Instead, MATLAB interprets x < y < z as (x < y) < z, comparing the logical result of x < y (either 0 or 1) to the value z. Statements using this type of interval testing rarely yield useful results.

Suggested Action

Break the comparison, x < y < z, into a series of binary comparisons. If all arguments are numeric scalars, use the form (x < y) && (y < z). Otherwise, use the form (x < y) & (y < z).