get status value by masking irrelevant bit
y = vb_get_status_mask(x)
y = vb_get_status_mask(x, mask_bit)
y = vb_get_status_mask(x, mask_bit, status_offset)
--- Input
x : status signal (1 x T or T x 1)
status_offset : shift value for status
x = x - status_offset
mask_bit : binary bit mask pattern [STRING]
Ex. '1100'
Matlab binary expression
Left-> higher bit Right-> lower bit
12 = 1100
20 = 10100
28 = 11100
36 = 100100
2009-6-10 Masa-aki Sato
Copyright (C) 2011, ATR All Rights Reserved.
License : New BSD License(see VBMEG_LICENSE.txt)0001 function y = vb_get_status_mask(x, mask_bit, status_offset) 0002 % get status value by masking irrelevant bit 0003 % y = vb_get_status_mask(x) 0004 % y = vb_get_status_mask(x, mask_bit) 0005 % y = vb_get_status_mask(x, mask_bit, status_offset) 0006 % --- Input 0007 % x : status signal (1 x T or T x 1) 0008 % status_offset : shift value for status 0009 % x = x - status_offset 0010 % mask_bit : binary bit mask pattern [STRING] 0011 % Ex. '1100' 0012 % Matlab binary expression 0013 % Left-> higher bit Right-> lower bit 0014 % 12 = 1100 0015 % 20 = 10100 0016 % 28 = 11100 0017 % 36 = 100100 0018 % 0019 % 2009-6-10 Masa-aki Sato 0020 % 0021 % Copyright (C) 2011, ATR All Rights Reserved. 0022 % License : New BSD License(see VBMEG_LICENSE.txt) 0023 0024 % dec2bin(d) は、dの2進数表現を文字列として出力 0025 % bin2dec(binarystr)は、バイナリ文字列を等価な10進数として出力 0026 % C=bitand(A,B)は、2つの非負の整数引数AとBのビット単位の論理積 0027 0028 % value for NIRS-EEG online BCI 0029 % 0030 %Trigger.Task1 = 12; % 00110000 NIRS=1 0031 %Trigger.Task2 = 20; % 00101000 NIRS=2 0032 %Trigger.Task3 = 28; % 00111000 NIRS=3 0033 %Trigger.Task4 = 36; % 00100100 NIRS=4 0034 0035 0036 % Offset 0037 if nargin < 3 || isempty(status_offset) 0038 status_offset = 0; 0039 end 0040 0041 % Mask Bit 0042 if nargin < 2 || isempty(mask_bit) 0043 mask_bit = ''; 0044 end 0045 0046 y = x - status_offset; 0047 if ~isempty(mask_bit) 0048 mask_val = bin2dec(mask_bit); 0049 y = bitand(y, mask_val); 0050 end 0051 0052 return 0053 0054 %y = zeros(size(x)); 0055 % 0056 %for n=1:length(x) 0057 % y(n) = bitand(x(n),mask_val); 0058 %end