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function y = subbackground( x ) % % SUBBACKGROUND( x ) - subtract linear background from signal x % n = size( x, 2 ); % use linear regression to compute and remove linear background b = ( n*[1:n]*x' - sum([1:n])*sum(x) ) / (n*[1:n]*[1:n]' - sum([1:n])^2); a = mean(x) - b * mean([1:n]); background = a + b * [1:n]; y = x - background; end