Finding X value corresponds to a particular Y value?

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Gaya V
Gaya V 2013-7-15
评论： Image Analyst 2023-8-29
I have a matrix , X=[5 6 9 8 4] Y=[8 7 2 1 9] If I plot this and I need to get position of the X value corresponds to Y=1, that means in which row the X value 8 is located? answer should be 4th position. How do I find this if the size of matrix is very big.. Please help me
  2 个评论
Pooja Patel
Pooja Patel 2016-8-29
value = find(Y == Y); xaty = x(value) or u can take find(Y == 1) this will also work if size is big
Guillaume
Guillaume 2016-8-29
@Pooja Patel
value = find(Y == Y)
That is exactly the same as
value = 1:numel(Y)

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回答（1 个）

Andrei Bobrov
Andrei Bobrov 2013-7-15
X=[5 6 9 8 4];
Y=[8 7 2 1 9];
idx = find(Y == 1);
Xidx = X(idx);
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Thomas
Thomas 2023-8-29
Thanks Andrei Bobrov level 9 MVP on 15 Jul 2013! I was able to finish my code for homework because of you!
Image Analyst
Image Analyst 2023-8-29
@jop schilder you would do that this way
mask = (Y == 1) | (Y == 2) | (Y == 7); % Logical vector (Only 0's and 1's)
indexes = find (mark) % Vector of actual index locations (e.g. [39, 123, 348, 983, 8943, ....etc.]

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