Adding to an already existing matlab struct in a for loop

Hi all,

I am proccessing 20 data sets with a for loop.

myFolder = ''
File_Struct = dir(fullfile(myFolder, '*.ap'))
filenames = {File_Struct.name};
numfiles = length(filenames);
for K = 1 : numfiles
File_Path {K} = fullfile(File_Struct(K).folder, File_Struct(K).name);
thisfile = filenames{K};
x = importdata( thisfile );
U=x.data(:,1);
Y=x.data(:,2);
P=x.data(:,3);
Data.C(1).TimeSeries=U';
Data.C(1).TimeSeries=P';
Data.C(1).TimeSeries=Y';
save(fullfile(File_Struct(K).folder, sprintf('Data_%d.mat',K)),'Data')
end

So this code provides me with 20 .mat files named as Data_1,.....,Data_20.

I want to repeat same above procedure on another 20 sets of data, but instead of saving them seperatly, I want matlab to load Data_1, and add the Data_1 from second batch and so on. see below:

myFolder2 = ''
File_Struct2 = dir(fullfile(myFolder2, '*.ap'))
filenames2 = {File_Struct2.name};
numfiles2 = length(filenames2);

for K = 1 : numfiles
File_Path2 {K} = fullfile(File_Struct2(K).folder, File_Struct2(K).name);
thisfile2 = filenames2{K};
x = importdata( thisfile2 );
U=x.data(:,1);
Y=x.data(:,2);
P=x.data(:,3);
Data.C(2).TimeSeries=U';
Data.C(2).TimeSeries=P';
Data.C(2).TimeSeries=Y';
save(fullfile(File_Struct(K).folder, sprintf('Data_%d.mat',K)),'Data')
end

I am not sure how to let matlab load the Data file saved at step 1 and let matlab save on it.

ANy help is apprecaited

Answer 1

[maryam al labbad]

Actually, I ran the first code in all of the 40 data sets. So I need a way mostly to combine the data automatically in struct array (1) and (2).

Every 20 .mat files are saved in seperate folder. That is why I was thinking to load the 1_data.mat from folder 1, and somehow load data_1.mat from folder 2 and combine. Thanks

[Mathieu NOE]

so, if I understand correctly, you have a total of 40 files splitted in 2 folders containing 20 files (having same name structure (data_1.mat exist in both folders)

you could do one single for loop as you are guaranteed to have same numer of files in both folders

myFolder1 = ''
File_Struct1 = dir(fullfile(myFolder1, '*.ap'))
filenames1 = {File_Struct1.name};
numfiles = length(filenames1);
%%%
myFolder2 = ''
File_Struct2 = dir(fullfile(myFolder2, '*.ap'))
filenames2 = {File_Struct2.name};
numfiles2 = length(filenames2);

[Mathieu NOE]

and then do :

for K = 1 : numfiles
File_Path {K} = fullfile(File_Struct(K).folder, File_Struct(K).name); % not sure it is used anywhere
thisfile = filenames{K};
x1 = importdata( filenames1{K} );
% U=x.data(:,1);
% Y=x.data(:,2);
% P=x.data(:,3);
Data.C(1).UU=(x1.data(:,1))';
Data.C(1).YY=(x1.data(:,2))';
Data.C(1).PP=(x1.data(:,3))';

Data.C(2).UU=(x2.data(:,1))';
Data.C(2).YY=(x2.data(:,2))';
Data.C(2).PP=(x2.data(:,3))';

save(fullfile(File_Struct(K).folder, sprintf('Data_%d.mat',K)),'Data')
end

[maryam al labbad]

Thanks a lot!!

Answer 2

[Mathieu NOE]

hello

first , I am not sure what you are doing here :

Data.C(1).TimeSeries=U';
Data.C(1).TimeSeries=P';
Data.C(1).TimeSeries=Y';

the second line will overwritte the first and so forth

for the second part of the question, you can create the Data cell aray inside the loop

and then , outside the for loop, save the entire Data cell array in one shot

for 
....

[maryam al labbad]

Thanks for the replay, please diregard the :

Data.C(1).TimeSeries=U';
Data.C(1).TimeSeries=P';
Data.C(1).TimeSeries=Y';

I am using different code but listed this since that one is long. it is something like:

Data.C(1).UU.TimeSeries=U';
Data.C(1).PP.TimeSeries=P';
Data.C(1).YY.TimeSeries=Y';

basically, considering the 40 data sets I have, I need to store every 2 in one file to end up with 20 files in total.

So, I am not sure if I should load the first data set within the loop and then save the second data set on the file and so on? if so would you please show an example of how could this be done?

thanks

[Mathieu NOE]

sory , my last part of my reply was broken

once you are done with the for loop , and Data is filled with all the required data ,

why not simply save in one file :

save(fullfile(File_Struct(1).folder, 'Data_all.mat','Data')