Efficient way to delete multiple elements from a vector in matlab

Asked Aug 12 '14 at 14:05

Active Aug 12 '14 at 15:36

Viewed 602 times

I have looked around for an answer to this but could not see anything relevant.

I am timing some (Matlab) code and there is one part which takes up a large amount of time. I have a vector, V, of integers (that may contain repeats) and I have a much smaller vector, v, contain indices of elements that I wish to delete. I am currently implementing this as:

V(v) = [];

'V' is something that I am selecting indices from at random and without replacement. 'v' must not contain duplicates.

Any suggestions?

edited Aug 12 '14 at 15:36

Sam

7,252
16
46
65

asked Aug 12 '14 at 14:05

Martin Ritchie

What are the sizes of your matrices? – kkuilla Aug 12 '14 at 14:09
can you give a minimal example – Nishant Aug 12 '14 at 14:10
3

Take a look at this: http://stackoverflow.com/q/19633192/2586922 – Luis Mendo Aug 12 '14 at 14:17
Sorry for the slow reply. V is a vector of length roughly ~100000, v is a vector : length(v) < 10. – Martin Ritchie Aug 13 '14 at 12:50
MATLAB is reallocating the array because you are changing its size; rather than deleting elements, consider replacing them with NaN. Also, is this code being executed multiple times in a loop, or is a single instance running slow? – siliconwafer Aug 13 '14 at 17:48

Efficient way to delete multiple elements from a vector in matlab

0 Answers0