Finding Minimum Distance Between Points to Find Indexed Variable

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Jonathan Pinko
Jonathan Pinko 2020-3-12
评论： Jonathan Pinko 2020-3-24
Hi All,
Two matrices, one here with size 1251x3:
dtamatrix = [xFe54t(:),Fo(:),DeltaFe56(:)];
And another one here, with size 4x1:
Felimitmatrix = [Foyqlimit(:)]
First, I want to find which values of Fo each of my Foyqlimit values are closest to, generating four values of Fo. Then, I want my code to read the specific xFe54t values that correspond with these four values of Fo, generating a 4x1 column vector of xFe54t values.
Can anyone provide any insight as to how to do this?
Thanks,
Joanthan
  2 个评论
darova
darova 2020-3-12
Too much explanations. Couldn't handle them
Can you make a simple drawing or something?
Jonathan Pinko
Jonathan Pinko 2020-3-13
A drawing would be tough, but I'll try to simplify things. I've changed things a little.
Two matrices, one here with size 1251x3:
dtamatrix = [xFe54t(:),Fo(:),DeltaFe56(:)];
And another one here, with size 4x1:
Felimitmatrix = [Foyqlimit(:)]
First, I want to find which values of Fo each of my Foyqlimit values are closest to, generating four values of Fo. Then, I want my code to read the specific xFe54t values that correspond with these four values of Fo, generating a 4x1 column vector of xFe54t values.
How could I do this?
Thanks for responding.

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采纳的回答

Turlough Hughes
Turlough Hughes 2020-3-13
编辑：Turlough Hughes 2020-3-13
If you don't have the statistics and machine learning toolbox you can do the following:
[~,idx] = min(abs(dtamatrix(:,2) - Felimitmatrix.')); % for 2016b and later
and alternatively for versions prior to 2016b
[~,idx] = min(abs(bsxfun(@minus,dtamatrix(:,2),Felimitmatrix.'))); % before 2016b
Results:
xFe54t_Flim = dtamatrix(idx,1);

更多回答（1 个）

darova
darova 2020-3-13
Use pdist2 to find closest points
D = pdist2(Fo(:),Foyqlimit(:)); % every combination (Matrix 1251x4)
[~,ix] = min(D); % closest indices
xFe54t(ix) % values you want

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