set some values to zero in a matrix
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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 Commenti
Walter Roberson
il 14 Apr 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.
Risposte (1)
madhan ravi
il 14 Apr 2019
Modificato: madhan ravi
il 14 Apr 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
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