pick one value from each row in a matrix, to get vector

1 次查看（过去 30 天）
Kim
Kim 2014-6-8
回答： André Paradis 2014-6-8
I have a 500x8 matrix, lets call this X, and I have a 500x1 vector, lets call it Y, the latter contains numbers between 1 and 8. These numbers indicate the number in each row that I want from the matrix X. So if Y(2,1)=3, then I need X(2,3). So by picking a number in each row of matrix X, I need to get a vector, lets call it Z. I dont know how to get this vector Z, in a quick way (not using a loop). Thank you for your help.

请先登录，再回答此问题。

采纳的回答

John D'Errico
John D'Errico 2014-6-8
编辑：John D'Errico 2014-6-8
X(sub2ind(size(X),1:500,Y))
Easily enough done without sub2ind also, but might as well use the existing tool. If you would insist though...
X(1:500 + 500*(Y-1))

更多回答（1 个）

André Paradis
André Paradis 2014-6-8
for i=1:500
Z=X(i,Y(i))
end
Where Y is a column vector

类别

在 Help Center 和 File Exchange 中查找有关 Matrices and Arrays 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by