add column to file with dlmwrite
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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',' ')
回答（1 个）
Walter Roberson
2019-4-5
0 个投票
Only by rewriting the entire file.
4 个评论
Marisabel Gonzalez
2019-4-5
Walter Roberson
2019-4-5
oldfile = dlmread('testfile1.txt');
A = [0.23; 0.44; 0.65; 0.12];
oldfile(1:length(A), end+1) = A; %done this way in case the rows are not the same
dlmwrite('testfile1.txt', oldfile, 'newline', 'pc', 'delimeter', ' ');
Devikrishna
2023-1-12
My matrix is in the form 39×39 I want to add a column using dlmwrite and make 39× 40
Walter Roberson
2023-1-12
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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2019-4-5
2023-1-12
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