findfirst

Version 1.1.0.0 (2.33 KB) by Richard Hindmarsh
MEX file for finding first or last non-zero.
4.0
(1)
1.6K Downloads
Updated 18 Jun 2009

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[VALUE,INDEX] = FINDFIRST(A,SEARCHDIR)
Returns the value and optionally index of the first non-zero in A.
A must be full and double
If SEARCHDIR = 'first' (default) the search is from the first index
If SEARCHDIR = 'last', the search is backwards from the last index

This is a cmex file, and is an order of magnitude faster than using FIND, and two orders of magnitude faster than using MATLAB loops.

Tested on Windows NT/2000 VC 6.0, Linux (gcc 2.95) and Solaris (courtesy A Pearson)

Cite As

Richard Hindmarsh (2026). findfirst (https://uk.mathworks.com/matlabcentral/fileexchange/2631-findfirst), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R13
Compatible with any release
Platform Compatibility
Windows macOS Linux
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Version Published Release Notes
1.1.0.0

Changed to BSD license
1.0.0.0