How to create a matrix from a txt file with variable column numbers?
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Diogo Nascimento
on 11 Apr 2016
Commented: Diogo Nascimento
on 12 Apr 2016
Hey there!
I am trying to create a matrix from a txt file that the user inputs that goes like this:
Matrix
4
1 1 3 2 6 1
2 1 4 3 5 2 5
3 1 3 4 8 3
4 1 3 5 1 6
The number in the line after "Matrix" represents the number of lines of the matrix I wanna create.
The number of the 3rd column represent the remaining entries on that line and can only vary between 3 or 4.
I've come up with
tline = fgetl(file);
n = fscanf(file,'%f',1);
matrix = fscanf(file,'%e', [n inf]); % but this puts it into a 1x... Matrix...
Thanks for the help
2 Comments
Accepted Answer
Walter Roberson
on 12 Apr 2016
tline = fgetl(file);
n = fscanf(file, '%f', 1);
for K = 1 : n
rownum = fscanf(file, '%f', 1);
col_offset = fscanf(file, '%f', 1);
num_ent = fscanf(file, '%f');
data_for_row = fscanf(file, '%f', [1 num_ent]);
data(rownum, col_offset + (0:num_ent-1)) = data_for_row;
end
This will pad shorter rows with 0. I had to guess at the meaning of the fields.
3 Comments
Walter Roberson
on 12 Apr 2016
Change
num_ent = fscanf(file, '%f');
to
num_ent = fscanf(file, '%f', 1);
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