Dump a struct to an ascii delimited file

Dear all, I have a code that looks like that

for i=1:10
  mystruct.filename=sprintf('test %d',i);
  mystruct.number=1;
end

and I want to dump these data in ascii file with comma or tab delimited Every line in the file I want to be one iteration so the file to look like

test1,1 test2,2 test3,3 ...

How can I dump a struct to an ascii file?

Best Regards Alex

[Friedrich]

Are you sure that your code looks like this? Since the above code will result in one struct with

filename: 'test 10'

number: 1

as values/fields.

Answer 1

[Friedrich]

Hi,

only a guess:

for i=1:10
   mystruct(i).filename=sprintf('test %d',i);
   mystruct(i).number=i;
end

txt = struct2cell(arrayfun(@(x) structfun(@num2str,x,'UniformOutput',false),mystruct));

tmp = squeeze(strcat(txt(1,1,:),',',txt(2,1,:),';'));

fid = fopen('out.txt','w');
fprintf(fid,'%s',strcat(tmp{:}))
fclose(fid)

[Alex]

Ok my bad!

I was trying to keep it simple!

my struct is an array of items. So Friedrichs answer works.

Just a small change

txt = struct2cell(arrayfun(@(x) structfun(@num2str,x,'UniformOutput',false),s));

%

a = squeeze(txt);

size(a)

ans =

19 138

as you can see I converted this struct to matrix so I want to

dump this matrix to a file by using semicolon as a delimeter.

I want to store the matrix to the file by keeping its structure as it is.

Have a nice evening

Best Regards

Alex

[Alex]

Any update on this?

In brief I want to dump a [19,138] matrix to a file

by writing

19 rows in a txt file

and having all the columns (138) with comma delimited.

B.R

Alex

[Friedrich]

Can you give us details about the exact data structure? If its really a matrix you can use dlmwrite to put it into a file in one go. But I doubt this will work in your case.

[Alex]

It was a struct converted to a matrix like struct by using

txt = struct2cell(arrayfun(@(x) structfun(@num2str,x,'UniformOutput',false),s));

There are cells that contain string and few that contain numbers.

That helps?

[Friedrich]

Not really, can you post a small version of your variable s?

[Friedrich]

Another guess. I created a dummy cell a which has some rows and columns:

a = {'abcde', 'fghi', 'jk','l'; '1','2','3','4'};

[n m] = size(a);

b = cell(n,2*m);

b(:,1:2:2*m-1) = a;

b(:,2:2:end) = {','};

b(:,end) = {';'};

fid = fopen('out.txt','w');

for i=1:n

fprintf(fid,'%s \n',strcat(b{i,:}));

end

fclose(fid);

[Alex]

Ok this one worked for me!!!!

txt = struct2cell(arrayfun(@(x) structfun(@num2str,x,'UniformOutput',false),s));

for k=1:length(s) % Dump rows to the file. Every struct entry is a line into the file

formRow=squeeze((strcat(txt(:,:,1),';')));

fid = fopen('measurementLogFiles.txt','a');

fprintf(fid,'%s',formRow{:});

fclose(fid);

end

My problem is that I want now to write the new rows into a new lines.

As the code is righ now every row is appended to the right of the last one. Unfortunately I can not split that into many new lines in excel.

Could you please help me append every measurement with a cr and lf?

I would like to thank you in advance for your help

B.R

Alex