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how to find y axis value's opposite x axis value

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skyhunt
skyhunt 2015-4-29
评论： KL 2015-4-29
for ex:x=1,2,3,4,5,6;y=2,7,8,9,4,1 i want pick up the y axis (9) opposite x axis value

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KL
KL 2015-4-29
If both vectors are of same size, find the index of your variable from y and use it to pick the value at that position in x. A simple example is
x = [1 2 3 4];
y = [5 6 7 8];
ind = find(y==7);
x(ind);
  2 个评论
Stephen23
Stephen23 2015-4-29
编辑：Stephen23 2015-4-29
Using logical indexing (as per Ilham Hardy's answer) is simpler and faster than using find.

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Ilham Hardy
Ilham Hardy 2015-4-29
>> x=[1,2,3,4,5,6];
>> y=[2,7,8,9,4,1];
>> opp_x = x(y==9)
opp_x =
4

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