command to merge .txt files

Hello,

I have multiple .txt files. Every .txt files has 1 row and 4 columns. I would like to merge these many files to one .txt file , with vertical format.

I use these commands in my code

txtFiles = dir('*.txt') ;  % get the text files in the present folder 
N = length(txtFiles) ;      % Total number of text files 
iwant = cell(N,1) ;         % initlaize the data required 
% loop for each file 
for i = 1:N
    thisFile = txtFiles(i).name ;
    iwant{i} = importdata(thisFile) ;  % read data of the text file 
end
iwant = cell2mat(iwant) ; 

but command window shows me an error:

Error using importdata (line 10)

Unable to load file.

Use readtable for more complex formats.

Caused by:

Index exceeds the number of array elements (1).

could anyone help me?

I am importing one .txt file in order to understand

[KSSV]

Attach your .txt file..what data it has? If not importdata, try load.

[Rik]

Why are all those NULLs in your file?

[Ivan Mich]

I do not know. I just wrote this:

for j=1:size(data)
    ......
fid = fopen(sprintf( 'file%g.txt',j), 'wt' );
fprintf(fid,'%s\t',St{j},R1,b,2)
fclose(fid)
end

in order to create them?

Can I remove the NULLs with one way?

Anyway how could I solve this?

[Stephen23]

"Can I remove the NULLs with one way?"

Not printing them in the first place would be a much better option.

[Ivan Mich]

How could I do that? I do not understand you

[Rik]

Apparently your data doesn't just contain normal char arrays, there are also NULL characters in there: char(0).

[Ivan Mich]

KSSV I have Imported my file1.txt

[Ameer Hamza]

As Stephen mentioned, you should avoid printing the NULL in the first place. You are probably trying to print numeric values as text values. Try the following line to create the text files

fprintf(fid,'%f\t',St{j},R1,b,2)