Average of a structure

Hey everyonone. I'd like to get the average of the same entry of each field inside a struct field (here: 'thickness') . This is what my data looks like :

To make it more exact I'd like to have a code to give me the following output:

avg(1)=mean(files.meas_data(1-9).thickness(1)

avg(2)=mean(files.meas_data(1-9).thickness(2)

and so on. I tried it using nested loops:

[

for k=1:length(files.meas_data.thickness)

    for l=1:length(files.files_during)

avg(k)=mean(files.meas_data(l).thickness(k))

    end

end

]

However I always get the following error message:

files =

             all: {18x1 cell}
    files_during: {9x1 cell}
       meas_data: [1x9 struct]

Error using length Too many input arguments.

Error in RunCode (line 11) for k=1:length(files.meas_data.thickness)

Appreciate your help very much. Please bear with me I just started matlab today.

Answer 1

[Stephen23]

Perhaps using arrayfun::

 arrayfun(@(s)mean(s.thickness),files.meas_data)

or a comma separated list and cellfun:

 S = files.meas_data;
 cellfun(@mean,{S.thickness})

[Sreejoe Kaniyamparambil]

Hey Stephen, Thank you. Unfortunatley this command gives me the average of each all the values inside a thickness field. I need the mean of the same entry in 'thickness' for all the thicknesses(9)

[Stephen23]

The thickness arrays have different sizes. How will you take the 107th value from meas_data(2).thickness, which only has 95 elements ?

You might be able to use Jos's excellent FEX submission padcat, something like this (untested):

 S = files.meas_data;
 M = padcat(S.thickness);
 nanmean(M,1)

Or perhaps, one at a time:

 N = 6;
 mean(cellfun(@(v)v(N),{S.thickness}))