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find_idx

version 1.1.0.2 (4.33 KB) by Bruno Luong
Fractional binning

2.1K Downloads

Updated 09 Jun 2021

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idx=find_idx(xi, xgrid)
This function not only bin similarly to HISTC, but also returns the fractional position of data points within the binning interval.
It is equivalent to
interp1(xgrid,(1:length(xgrid)), xi)
but with the speed improvement up to 5 times.
Algorithm: dichotomy, complexity of m.log(n), where m isnumber of data points (xi) and n is number of bins (xgrid).
Few obvious examples of applications:
- binning step for more sophisticated interpolation schemes such as multi-dimensional spline or linear tensorial interpolations.
- Generate discrete random sequences with given probability distribution.

Cite As

Bruno Luong (2021). find_idx (https://www.mathworks.com/matlabcentral/fileexchange/23049-find_idx), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2008b
Compatible with any release
Platform Compatibility
Windows macOS Linux
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