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Faster way of writing this code: (finding index)

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Evan
Evan on 22 Dec 2012
The code I want to optimize is:
index_min = sum( input > quantiles );
where quantiles is a vector of doubles in increasing order. I am using the sum function to find the index of quantiles that corresponds to the value of input. I think the "find" function is actually slower.
  2 Comments
Image Analyst
Image Analyst on 22 Dec 2012
Just how much speed do you require? Is this for a real time app, like for video processing? How much slower? Are we talking nanoseconds here?

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Answers (2)

Matt Fig
Matt Fig on 22 Dec 2012
That code does not return an index, but it does return the number of values in vector quantiles that are smaller than input.
  2 Comments
Matt Fig
Matt Fig on 22 Dec 2012
Yes, it will return the last value. How large is quantiles?

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