How to find the position of a real vector in a matrix?

10 visualizzazioni (ultimi 30 giorni)
I do have a very big matrix of real numbers, I need a function that takes a vector as input and returns its position in the matrix.
An example:
A =[
0.7081 0.0797 0.1418 0.5849 0.1305
0.0738 0.4849 0.5060 0.8479 0.5003
0.8723 0.1511 0.6346 0.0683 0.7673
0.2021 0.4461 0.7313 0.7355 0.4157
0.7050 0.8435 0.8158 0.2139 0.8008]
Suppose I want to find the position of
v=[ 0.7081 0.0797 0.1418 0.5849 0.1305]
in A
How can I do it?
I edited the question
  2 Commenti

Accedi per commentare.

Risposte (2)

dpb
dpb il 6 Mar 2020
>> find(ismember(A,v,'rows'))
ans =
1
>>
works here, but in general for floating point values
>> find(ismembertol(A,v,2*eps,'byrows',1))
ans =
1
>>
is more robust and will avoid surprises.
  2 Commenti
dpb
dpb il 7 Mar 2020
>> find(ismembertol(w,c,2*eps,'byrows',1))
ans =
1
>>

Accedi per commentare.


Walter Roberson
Walter Roberson il 6 Mar 2020
Dists = pdist2(A, v);
[mindist, rowidx] = min(Dists) ;
if mindist > some_tolerance
error('row not found') ;
end
  3 Commenti

Accedi per commentare.

Categorie

Scopri di più su Resizing and Reshaping Matrices in Help Center e File Exchange

Community Treasure Hunt

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

Start Hunting!

Translated by