MATLAB: Loop through a multi layered structure

loopsstructures

CompanyInfo=struct('ProjectName', '', 'Activities', struct ('Name', '',...
                                                          'Length',0,...
                                                          'Date', struct ('Day',0, ...
                                                                          'Month', 0)));
CompanyInfo.Activities = cell (1,3);

Once I have filled in all the fields, I want to calculate the length of each project with a loop, for example, calculating the Length of the first project by adding the length of its activities, but, how can I do it?

Best Answer

Why a loop? Why not simply use brackets to concatenate all lengths into a single vector:

allLengths = [CompanyInfo.Length]

Related Solutions

MATLAB: Indexing multiple values of an array of structures with a field that varies in length

John - why not use arrayfun to grab the last element of each structure in your array A. Something like

 lastElements = arrayfun(@(x)x.vec(end),A);

This seems to work for the following example

 % randomly choose the lengths of 100 vectors
 vecLengths = randi(42,100,1);
 % create A
 A = [];
 for k=1:length(vecLengths)
       A(k).vec = randi(255,1,vecLengths(k));
 end
 % get the last element from each vector
 lastElements = arrayfun(@(x)x.vec(end),A);

MATLAB: Since the variable changes size on every loop iteration, how to preallocate memory

You can do this:

%% Calculate dff

fd = prctile(Activity_smooth,10); %baseline, f0

% Calculating Activity(k)-fd/fd for photometry
Activity_dff = zeros(1, length(Activity_smooth));
for k = 1:length(Activity_smooth) 
   Activity_dff(k) = (Activity_smooth(k)-fd)/fd;
end
Activity_dff = Activity_dff(1:length(Activity_smooth));
Activity_dff_ds = group_z_project_vector(Activity_dff,2560); %to see in epoch

or even better, get rid of the loop and other unneeded stuff:

%% Calculate dff
fd = prctile(Activity_smooth,10); %baseline, f0
Activity_dff = Activity_smooth-fd ./ fd;
Activity_dff_ds = group_z_project_vector(Activity_dff,2560); %to see in epoch

Best Answer

Related Solutions

MATLAB: Indexing multiple values of an array of structures with a field that varies in length

MATLAB: Since the variable changes size on every loop iteration, how to preallocate memory

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