清空筛选条件
清空筛选条件

Can someone explain this loop?

1 次查看（过去 30 天）
Tri Dang
Tri Dang 2021-6-14
回答： Walter Roberson 2021-6-14
A = [0 1.7 2; 3 4 8; 4.2 3 8];
numEven = 0;
for k = 1:numel(A)
if mod(A(k),2) == 0
numEven = numEven+1;
end
end
Why numEven =5 ? Can someone explain? As I understand mod(A(k),2 == 0 is logical command therefore the sum of mod(A(k),2 supposed to be equal 5, and 5+1=6?
  2 个评论
SALAH ALRABEEI
SALAH ALRABEEI 2021-6-14
it counts the even numbers by checking the reminder of dividing by 2.
What is ur A!!
Tri Dang
Tri Dang 2021-6-14
Oh I editted the question
Can you check?
Thanks

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2021-6-14
The count starts out 0. Then you start going through the array in linear index order. Each time you find an even number, you increase the count by 1.
The first 0 is even so you increase the count from 0 to 1
The 2 is even so you increase the count from 1 to 2
The 4 and 8 are even so you increase the count to 3 and then 4
The 8 is even so you increase the count from 4 to 5.
There is nothing in the code that would add 1 to the 5.
Another way of writing the code is
numEven = nnz(mod(A,2) == 0)
with no loops.

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Loops and Conditional Statements 的更多信息

标签

产品


版本

R2021a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by