In the cases of subjects C and D, the difference in
accuracy is not noticeable for the LDA and the SRC. This is
perhaps due to the fact that the data size (the total number of
signals) is not large enough for the SRC to stand out since
for the SRC, the larger the dictionary the better the result is.
In addition, the accuracy of LDA is already quite high and
there is a little room for improvement.
When the number of training signals is large enough, say
59 training signals in the case of subject C, the proposed
SRC method shows high accuracy than LDA does. For
comparison of complexity, we have checked the run times in
MATLAB of the two algorithms: SRC took 37sec while
LDA took 34sec. Thus, we note that the computation cost of
SRC is a little larger than that of LDA.