You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: sll_decodemaxcorr.m
    path of file: ./repos/brainstorm3/external/scilearnlab
    
    the code of the file until where you have to start completion: function dec = sll_decodemaxcorr(data,condid,varargin)

%preliminary code, undocumented; please do not distribute
%data is 3D (variable
    
function d = decodemaxcorr(traindata,testdata,method)  

%initial variables
ncond = length(traindata);
ntimes = size(traindata{1},2);

% remove mean and divide by standard deviation (to speedup computation of Pearson corr)
for c = 1:ncond
    traindata{c} = bsxfun(@minus,traindata{c},mean(traindata{c},1));  % Remove mean
    sx = sqrt(sum(abs(traindata{c}).^2, 1)); % sqrt first to avoid under/overflow; (1/(n-1) doesn't matter, renormalizing anyway)
    traindata{c} = bsxfun(@rdivide,traindata{c},sx);
    testdata{c} = bsxfun(@minus,testdata{c},mean(testdata{c},1));  % Remove mean
    sx = sqrt(sum(abs(testdata{c}).^2, 1)); % sqrt first to avoid under/overflow
    testdata{c} = bsxfun(@rdivide,testdata{c},sx);
end