Home > vbmeg > functions > device > active_check > vb_find_bad_channel.m

vb_find_bad_channel

PURPOSE ^

find bad channel with large max_ratio for number of trials

SYNOPSIS ^

function [ix_ch,flg] = vb_find_bad_channel(ratio1,ratio2,thred_val,prob_val)

DESCRIPTION ^

 find bad channel with large max_ratio for number of trials
  [ix_ch] = vb_find_bad_channel(ratio1,ratio2, thred_val, prob_val)
 ratio1,ratio2 : max ratio : large value indicates bad channel/trials
 thred_val : threshold value
 prob_val  : probability for bad trials to select bad channel
 ix_ch : list of bad channel
 
 2008-6-1 Masa-aki Sato
 2009-1-9 Masa-aki Sato

 Copyright (C) 2011, ATR All Rights Reserved.
 License : New BSD License(see VBMEG_LICENSE.txt)

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function    [ix_ch,flg] = vb_find_bad_channel(ratio1,ratio2,thred_val,prob_val)
0002 % find bad channel with large max_ratio for number of trials
0003 %  [ix_ch] = vb_find_bad_channel(ratio1,ratio2, thred_val, prob_val)
0004 % ratio1,ratio2 : max ratio : large value indicates bad channel/trials
0005 % thred_val : threshold value
0006 % prob_val  : probability for bad trials to select bad channel
0007 % ix_ch : list of bad channel
0008 %
0009 % 2008-6-1 Masa-aki Sato
0010 % 2009-1-9 Masa-aki Sato
0011 %
0012 % Copyright (C) 2011, ATR All Rights Reserved.
0013 % License : New BSD License(see VBMEG_LICENSE.txt)
0014 
0015 %if length(thred_val)==1, thred_val = [thred_val, 150, 5]; end;
0016 %if length(thred_val)==2, thred_val = [thred_val, 5]; end;
0017 
0018 switch    length(thred_val)
0019 case    1
0020     % bad channel/trial with large max_ratio
0021     flg = (ratio1 > thred_val(1)) ...
0022         | (ratio2 > thred_val(1)) ;
0023 case    2
0024     % bad channel/trial with large max_ratio
0025     flg = (ratio1 > thred_val(1)) ...
0026         | (ratio2 > thred_val(2)) ;
0027 case    3
0028     % bad channel/trial with large max_ratio
0029     flg = (ratio1 > thred_val(1)) ...
0030         | (ratio2 > thred_val(2)) ...
0031         | (ratio1 < thred_val(3));
0032 end
0033 
0034 % bad channel with large max_ratio for number of trials
0035 ix_ch = find( sum(flg, 2) > prob_val*size(flg,2));
0036 
0037 return
0038 %%% END %%%

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