calculating number of comparison in a vector

if I have a vector with N elements and want to find the maximum M elements from them, how many comparison operations I need??

[Cesar Antonio Lopez Segura]

Can you explain your question with an example ?

[Image Analyst]

Is this your homework?

[Liza Afeef]

as an example, if I have a vector with 100 elements and need to take 25 elements that have the highest value, I need to make a comparison between all the elements in the vector. So my question is how many comparison operations I need ??

[jonas]

This does not seem to be a matlab question at all.

Answer 1

[Dimitris Kalogiros]

It depends on the algorithm than you will use.

You can use a bubble sort routine to sort the vector and then to choose M most max elements (or min elements).

[Liza Afeef]

I've already made the sorting inside my code but I need to know the number of operations that Matlab make to make the sorting.