Matlab&和<运算符

Question

在这个表达中

lmin=lminflag & ~kmod & actminsub<nsm*pminu & actminsub>pminu;

&运算符就像一个按位AND运算符？lminflag和kmod都是具有逻辑1或0作为元素的数组,并且lmin也变为1或0.

Answer 1

是.

1. & 是一个每元素AND运算符.
2. && 是一个标量AND运算符,条件执行语句的其余部分.

例如,给定:

a = true;
b = false;
aa = [true false];
bb = [true true];
fnA = @()rand>0.5; %An anonymous function returning true half the time

然后:

a &  b;  %returns false
a && b; %returns false (same as above)

然而

aa &  bb;  %this an error    
aa && bb; %returns the array [true false]

当操作数是函数时,它会更有趣,带有副作用.

b &  fnA;  %Returns false, and the `rand` function is called (including a small performance hit, and an update to the random state)
b && fnA;  %Returns false, and the `rand` function was not called (since `b` is false, the actual value of `fnA` doesn;t effect the result