Undefined function 'sum' for input arguments of type 'cell'.

Undefined function 'sum' for input arguments of type 'cell'.

Error in mean (line 116)
        y = sum(x, dim, flag)/size(x,dim);

Error in ccaFuse (line 69)
meanX = mean(trainX);

Error in CCA_feature_fusion (line 19)
[trainZ,testZ] = ccaFuse(trainX, trainY, testX, testY, 'concat');

%% program
clc;
clear all;
 load('db4.mat');
 load('db6.mat');
 load('db3.mat');
 load('db5.mat');
trainX =reduced_traindata;
trainY = reduced_traindata;
testX = reduced_testdata;
testY = reduced_testdata;
[trainZ,testZ] = ccaFuse(trainX, trainY, testX, testY, 'concat');

[dpb]

Didn't show us the pertinent code where the error actually is, but the message is clear. Apparently your variable trainX is a cell; and mean can't take the mean of the cell but has to have the content of the cell. Dereference the cell with "the curlies" {}.

W/o downloading the files don't know what is actually in the cell, but if is just a double vector, use

meanX = mean(trainX{:});

or, instead convert the cells to double in the calling code first:

trainX=cell2mat(reduced_traindata);
trainY=cell2mat(reduced_traindata);
testX=cell2mat(reduced_testdata);
testY=cell2mat(reduced_testdata);

before calling ccaFuse

[Balaji M. Sontakke]

wow!! perfect

[Balaji M. Sontakke]

where is accept answer button?