add column to file with dlmwrite

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Marisabel Gonzalez
Marisabel Gonzalez il 5 Apr 2019
Commentato: Walter Roberson il 12 Gen 2023
Hello, is there anyway to add a column to an existing file using dlmwrite?
I've tried to transpose it to add lines instead and later convert it to columns again but I get the error " FILENAME must be a character vector "
A = [0.23;0.44;0.65;0.12];
A = A';
oldfile = dlmread('testfile1.txt');
oldfile = oldfile';
dlmwrite(oldfile,A,'-append','newline','pc','delimiter',' ')

Risposte (1)

Walter Roberson
Walter Roberson il 5 Apr 2019
Only by rewriting the entire file.
  4 Commenti
Devikrishna
Devikrishna il 12 Gen 2023
My matrix is in the form 39×39 I want to add a column using dlmwrite and make 39× 40
Walter Roberson
Walter Roberson il 12 Gen 2023
The way that text files are designed in Windows, Mac, and Linux makes it impossible to add additional information to a row without rewriting the entire file. That applies not just to dlmwrite but also to writematrix and to using excel.
You need to use a system like I posted the code for, of reading the existing file, adding the new column in memory, and writing out the revised content

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