problem with mean in cell arrays

for k=1:8
   cd(phonemes{k});
   data=dir('*.pcm');

      for i=1:length(data)
          fid=fopen(data(i).name,'r');
          phone{k}.train_sig{i}=fread(fid,inf,'int16');
          phone{k}.train_mfcc{i}=frontend(phone{k}.train_sig{i});%extracting mfcc's
          m{k}.e{i}=mean(phone{k}.train_mfcc{i});%each value for m{k}.e{i} is 1x12 array

          fclose(fid);

      end
      v{k}=mean({m{k}.e{:}});%error undefined sum
  end

i make this code and now i want to calculate the mean for m{k}.e{:},namely the mean for each m{k}. for all e{} elements !! any ideas ?? i tried v{k} but its wrong..any help??

Answer 1

[Sven]

v{k} = mean([m{k}.e{:}])

The mean() function calculates the mean of an array of numbers, not a cell.

The above should work because you stated that each value for m{k}.e{i} is 1x12. If instead they were column matrices (ie, 12x1), then you couldn't concatenate them horizontally with [], but could instead use

mean(cat(1,m{k}.e{:}))

[panagiotis]

thx a lot sven! :)