How to write a .txt file in this way?

I am writing a code like this

           if D == 0
           d0_L2_pre = norm(v).^2;
           else
           d0_L2_pre = norm(v).^2/abs(D);
           end

I want to store the results(d0_L2_pre) in a .txt file like the way it is showing in the picture. I was trying

LastName = {'M-01';'M-02';'M-03';'M-04';'M-05';'M-06';'M-07';'M-08';'M-09';'M-10';'M-11';'M-11'};
         d0_L2_Pre = [d0_L2_pre];
         T = table(d0_L2_Pre,'RowNames',LastName);
         writetable(T,'distance.txt','WriteRowNames',true)  
         type 'distance.txt'

And then how to save the .txt file in certain directory?

How to edit or write a new code which will write a .txt file just like the picture.

Answer 1

[Stephen23]

Writing that file is easy and efficient with one loop:

C = {'pre','post','shift'};
[fid,msg] = fopen('test.txt','wt');
assert(fid>=3,msg)
for k = 1:numel(C)
    D = rand(1,12); % fake data
    X = 1:numel(D);
    fprintf(fid,'"d0_L2_%s"\n',C{k})
    fprintf(fid,'"M%d" %.16f\n',[X(:),D(:)].')
end
fclose(fid);

It generates this file:

"d0_L2_pre"
"M1" 0.8101833471970885
"M2" 0.3228280263956013
"M3" 0.9313125812216142
"M4" 0.0930197953819751
"M5" 0.1431754035600110
"M6" 0.0191395364706218
"M7" 0.3733887218661779
"M8" 0.5956394051737841
"M9" 0.1549615401190287
"M10" 0.2166245210274229
"M11" 0.1375581615241128
"M12" 0.4638896483775406
"d0_L2_post"
"M1" 0.9800029232465585
"M2" 0.6889261537441198
"M3" 0.3944793330174778
"M4" 0.9784100986414408
"M5" 0.7345622798805288
"M6" 0.9344731006203441
"M7" 0.5680906731481710
"M8" 0.3412121838601810
"M9" 0.2602806479751585
"M10" 0.5306524038227418
"M11" 0.3839486545914291
"M12" 0.6184793329342448
"d0_L2_shift"
"M1" 0.4395118376041331
"M2" 0.9157654018281208
"M3" 0.4117131471312308
"M4" 0.1698818550755265
"M5" 0.4333299487649594
"M6" 0.1036376088665931
"M7" 0.7037719110569336
"M8" 0.3658712106700369
"M9" 0.7182559095641131
"M10" 0.0579546739859127
"M11" 0.7510618251853217
"M12" 0.8921570052671490

[Mr. 206]

Thank you so much. I am sorry, It is working, I didn't noticed the generated test.txt file. How can save it in certain directory? And how to print like

"d0_L2_pre"
"d0_L2_post"
"d0_L2_shift"
"d1_L2_pre"
"d1_L2_post"
"d1_L2_shift"

[Stephen23]

"How can save it in certain directory?"

F = 'folder where you want the files saved';
...
[fid,msg] = fopen(fullfile(F,'test.txt'),'wt');

"And how to print like..."

fprintf(fid,'"d%d_L2_%s"\n',fix((k-1)/3),C{k})

[Mr. 206]

Here is the output..

[Mr. 206]

The fake data(D) that you use is a vector, whereas in my case my data is coming from some loop, and it is not a simple loop to store all the data in a vector. In this case how can i use D(:)? Is there any other way to feed the value(for example D is coming from several loop) in this case.

And i appreciate your help. Thanks

[Stephen23]

@Atta: it is often easier and more convenient to put data into an array, which is why I used vector D. If your code generates one values at a time, then you can print to the file one line at a time too. Replace the two fprintf calls with this:

fprintf(fid,'"d%d_L2_%s"\n',fix((k-1)/3),C{k})
for ii = ...
    val = your calculation which returns one scalar value
    fprintf(fid,'"M%d" %.16f\n',ii,val)
end

[Mr. 206]

Hi @Stephen I solved the issue regarding 'D(:)', I managed to store them in an array. Thanks.

However as the D value varies from time to time, i modified your code like this. And it creates an empty file in the directory.

here is the code...

           Distance_File = '/home/ali/Master_Thesis_Ali/Test_output_02';
           C = {'pre','post','shift'};
           [fid,msg] = fopen(fullfile(Distance_File,'test.txt'),'wt'); 
           assert(fid>=3,msg)
           cc = 0;
           for k = 1:numel(C)
               cc = cc+1;
               if  cc == 1
               D = d0_L2_pre;
               elseif cc == 2
               D = d0_p_pre;
               else
               D = d1_p_pre;
               end
               X = 1:numel(d0_p_pre); 
               fprintf(fid,'"d%d_L2_%s"\n\n',fix(k/4),C{k})
               fprintf(fid,'"M%d" %.16f\n',[X(:),D(:)].') 
               end
           fclose(fid);

I also tried this

Distance_File = '/home/ali/Master_Thesis_Ali/Test_output_02';
           C = {'pre','post','shift'};
           [fid,msg] = fopen(fullfile(Distance_File,'test.txt'),'wt'); 
           assert(fid>=3,msg)
           for k = 1:numel(C)
               if  k == 1
               D = d0_L2_pre;
               elseif k == 2
               D = d0_p_pre;
               else
               D = d1_p_pre;
               end
               X = 1:numel(d0_p_pre); 
               fprintf(fid,'"d%d_L2_%s"\n\n',fix(k/4),C{k})
               fprintf(fid,'"M%d" %.16f\n',[X(:),D(:)].') 
               end
           fclose(fid);

[Stephen23]

"And it creates an empty file in the directory."

Check the size of X and D.

Is the file totally empty, or does it include the header?

[Mr. 206]

Ahha! It was a dimensional mismatch! Thank you so much. It is working now!

Answer 2

[ANKUR KUMAR]

name={'pre','post','shift'}
A={rand(1,12),rand(1,12),rand(1,12)} %taking a random data for pre, post and shift
for kk=1:3
    column1=arrayfun(@(x) strcat('"M',num2str(x),'"'),1:12,'uni',0)';
    column2=arrayfun(@(x) num2str(x) , A{kk},'uni',0)';
    tab{kk}=[{strcat('d0_Ld2_',name{kk}),''};[column1 column2]]
end
table=cat(1,tab{:})
dlmcell('sample.txt',table)

Get the dlmcell function from https://in.mathworks.com/matlabcentral/fileexchange/25387-write-cell-array-to-text-file?focused=3804347&tab=function

[ANKUR KUMAR]

If the above prog seems to be difficult for you, then you can refer this. Both yields the same result.

clc
clear
name={'pre','post','shift'}
%for pre
A=rand(1,12);
column1=arrayfun(@(x) strcat('"M',num2str(x),'"'),1:12,'uni',0)';
column2=arrayfun(@(x) num2str(x) , A,'uni',0)';
tab1=[{'d0_Ld2_pre',''};[column1 column2]]

%for post
A=rand(1,12);
tab2=[{'d0_Ld2_post',''};[column1 column2]]

%shift
A=rand(1,12);
tab3=[{'d0_Ld2_shift',''};[column1 column2]]

table=[tab1;tab2;tab3];
dlmcell('sample.txt',table)

[ANKUR KUMAR]

Accept the answer if it helps you.

[Mr. 206]

The output is like this

[ANKUR KUMAR]

The screenshot which you have sent is correct. Your matlab is also showing is the location of every elements. Open that variable tab1 by typing open tab1.

[ANKUR KUMAR]

[ANKUR KUMAR]

dlmcell('sample.txt',tab1)

Save this output and open the text file. And send us the screenshot of text file too.

Get the dlmcell function from here .

[ANKUR KUMAR]

See the output file, resulted from the very first code.