set some values to zero in a matrix

7 vues (au cours des 30 derniers jours)
Nikolaos Zafirakis
Nikolaos Zafirakis le 13 Avr 2019
Hello, I have a 6x20000 matrix. I would like make the 3 smalest values on each row equal to zero. For example if I have:
[ 1, 1, 1, 1.5, 1.5, 1.5 = [ 0, 0, 0, 1.5, 1.5, 1.5
1, 1.5, 1, 1, 1.5, 1.5 0, 1.5, 0, 0, 1.5, 1.5
1, 1.5, 1, 1, 1.5, 1.5] 0, 1.5, 0, 0, 1.5, 1.5]
Does anyone know how to do this?
  2 commentaires
Walter Roberson
Walter Roberson le 14 Avr 2019
What do you want to do if there are four or more copies of the same minimum value?
What do you want to do if there is a distinct minumum value, but then there is a tie for second or third place such that the total number of values no greater than the third smallest, is more than 3? Such as [1 1.5 1 1.5 1.5 1.5]: here the two 1's are smallest, but there is a tie of 1.5's for third.
Nikolaos Zafirakis
Nikolaos Zafirakis le 14 Avr 2019
Hello well I actually took the code supplied by madhan below. The matrix is coordinates x-y-z and -x -y -z. I split the matrix into 3 sections making x and -x one matrix y and -y another ...etc. Then I applied the code by madhan to the 2x20000 matrix and took the largest value from this. Then I combined the matrix back together and have one value for each plane.

Connectez-vous pour commenter.

Réponses (1)

madhan ravi
madhan ravi le 14 Avr 2019
Modifié(e) : madhan ravi le 14 Avr 2019
Note: Have the same doubt as sir Walter but see if the below answer does what you want.
[~,I]=mink(a,3,2); % requires 2017 b and later if prior sort each row and pick first three values in each row, a is your matrix
idx=sub2ind(size(a), repmat((1:size(a,1)).',1,size(I,2)) ,I);
a(idx)=0
  1 commentaire
Nikolaos Zafirakis
Nikolaos Zafirakis le 14 Avr 2019
Thanks that was very helpful! (See above i solved the issue).

Connectez-vous pour commenter.

Catégories

En savoir plus sur Matrix Indexing dans Help Center et File Exchange

Community Treasure Hunt

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

Start Hunting!

Translated by