Matlab中对逻辑矩阵表达式的所有条目求和的表达式？
将矩阵中的所有元素相加，您通常会这样做
A = sum ( B(:) );
，这很好而且很短。然而，假设我们有一个像这样的逻辑表达式
B = B == 6
，并且我们想要对所有条目的元素求和，那么最聪明的方法似乎是这样做
A = sum ( sum ( B == 6 ) )
，或者
B = B == 6;
A = sum( B(:) );
两者都有点丑陋。所以我想知道有没有更好的表达方式？
A = sum ( (B == 6)(:) );
会很好，但不起作用。
To sum all the elements in a matrix you usually do
A = sum ( B(:) );
which is nice and short. However assume that we have a logical expression like this
B = B == 6
and we want to sum the elements of all the entries, then smartest way seems to be to do
A = sum ( sum ( B == 6 ) )
or
B = B == 6;
A = sum( B(:) );
Both are kind of ugly. So I was wondering is there a nicer expression?
A = sum ( (B == 6)(:) );
Would be nice but doesn't work.
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那么这个简单的解决方案有什么令人讨厌的......
So what is so nasty about the simple solution...
并不是我建议这样做，而是如图所示 以前，您实际上可以执行以下操作：
Not that I recommend this, but as was shown previously, you can actually do something like: