Find elements in vector that satisfy condition

8 次查看（过去 30 天）
Danielle Sisserman
Danielle Sisserman 2021-1-26
编辑： James Tursa 2021-1-26
say that I have the following matrix X:
x1 =[1 2]
x2 = [3 2]
x3 = [3 4]
X = [x1;x2;x3]
I need to get a matrix consisting of the rows in X that that satisfy the following condition:
x(1) == 3.
So my resulting matrix will be:
S = [x2;x3] = [3 2; 3 4]
How can I do this (for any dimension index, not necessarily 1)
Thank you

请先登录，再回答此问题。

采纳的回答

James Tursa
James Tursa 2021-1-26
编辑：James Tursa 2021-1-26
X = your big matrix
k = column number you want to examine
value = some number you are looking for
idx = (X(:,k) == value); % logical indexes of the rows where the element in column k is value
S = X(idx,:); % pick off the subset of rows that have value in column k

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Matrix Indexing 的更多信息

标签

产品

Community Treasure Hunt

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

Start Hunting!

Translated by