Home > chronux_1_15 > spikesort > utility > datatools > leading_edges.m

leading_edges

PURPOSE ^

LEADING_EDGES Marks 0 -> NONZERO transitions in binary data.

SYNOPSIS ^

function markers = leading_edges(data)

DESCRIPTION ^

LEADING_EDGES     Marks 0 -> NONZERO transitions in binary data.
   EDGEMARKERS = LEADING_EDGES(BINARYDATA) takes an M x N matrix
   BINARYDATA and returns a M x N matrix EDGEMARKERS, containing a '1' in
   each location that corresponds to the first nonzero value in a
   BINARYDATA column following one or more zeros above it in the same
   column.  EDGEMARKERS is of type logical.

   NOTE: If the first row of any BINARYDATA column contains a nonzero
   value, it will be marked in EDGEMARKERS.

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function markers = leading_edges(data)
0002 %LEADING_EDGES     Marks 0 -> NONZERO transitions in binary data.
0003 %   EDGEMARKERS = LEADING_EDGES(BINARYDATA) takes an M x N matrix
0004 %   BINARYDATA and returns a M x N matrix EDGEMARKERS, containing a '1' in
0005 %   each location that corresponds to the first nonzero value in a
0006 %   BINARYDATA column following one or more zeros above it in the same
0007 %   column.  EDGEMARKERS is of type logical.
0008 %
0009 %   NOTE: If the first row of any BINARYDATA column contains a nonzero
0010 %   value, it will be marked in EDGEMARKERS.
0011 
0012 markers = [diff([repmat(logical(0), 1, size(data,2)); (data>0)], 1, 1) > 0];

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