Multiply Even Variables in an Array
显示 更早的评论
I have initialized an array with values.
I have made a function that will determine if the integers within the array are odd or even. For the integers that are even, I want to multiply them by a set, finite number such as 5.
How would I do this?
回答（1 个）
Steven Lord
2021-2-23
0 个投票
8 个评论
Richard Dillenson
2021-2-23
I don't understand why I cannot do *=10 but I am able to assign them new finite values.
Steven Lord
2021-2-23
There's no such thing as a *= operator in MATLAB. But you have gotten half the solution:
x(rem(x, 2) == 0) =
That refers to the even elements in x on the left side. Now you need to figure out how to use logical indexing on the right of the equals sign.
Richard Dillenson
2021-2-24
James Tursa
2021-2-24
Just use a variable to store the logical indexes. E.g.,
ix = rem(x,2)==0;
Then use ix for indexing downstream in your code.
Steven Lord
2021-2-24
You want to take the even numbers from their locations in x, multiply them by 5, then stick the results back in the locations of the even numbers in the original x vector. Your left side does the "then stick the results back in the locations of the even numbers in the original x vector" piece. Given that's what it does, how would you do the "take the even numbers from their locations in x, multiply them by 5" piece?
Richard Dillenson
2021-2-24
James Tursa
2021-2-24
This is not correct. You need to use the exact same indexing on both sides of the assignment.
Steven Lord
2021-2-24
There are also mismatched parentheses. From the fact that Richard Dillenson said "Thank you" I assume that's an error when the solution was copy-and-pasted into Answers not an error in the code they ran.
类别
在 帮助中心 和 File Exchange 中查找有关 Logical 的更多信息
2021-2-23
2021-2-24
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
