findfirst

MEX file for finding first or last non-zero.

Description

[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)

• MATLAB release: MATLAB 6.5 (R13)
• Other requirements: Needs a C compiler

[Richard Hindmarsh]

The functionality of this routine is in the Matlab FIND command from Version 7

[Robert Young]

Useful, especially when writing code which must be backwards compatible with MatLab 6.
Had to reverse output arguments to make it more like find.

[Vincent Coral]

How do I install it? I think I don't have any C compiler actually...Anyone?