Reading different lines with different numbers of data

Hi

I have the following file where the data are organised in the following way:

$Nodes

1 16 0 1

146

9.616887654983829 -2.74143608924586 3.7

1 17 0 4

147

148

149

150

9.736663950053746 2.27977523535189 4.38

9.736663950053746 2.27977523535189 5.06

9.736663950053746 2.27977523535189 5.74

9.736663950053746 2.27977523535189 6.42

$EndNodes

So, I want to read this filename.txt file, and store the data in a matrix of size (*, 3). The three numbers in bold will form the 3 columns in the matrix.

How can I do that? Thanks in Advance.

Sanwar

Answer 1

[meghannmarie]

This code is assuming that the only lines that have 3 fields is your data:

file = 'filename.txt';
fileID = fopen(file);
data = double.empty(0,3);
line_ex = 1;
while all(line_ex ~= -1)
    line_ex = fgetl(fileID)
    if ischar(line_ex)
        line_ex = str2num(line_ex);
        if size(line_ex,2) == 3
            data(end + 1,:) = line_ex;
        end
    end   
end
fclose(fileID);

Answer 2

[Sanwar Ahmad]

Thanks, meghannmarie! I just needed the following modification.

file = 'filename.txt';

fileID = fopen(file);

data = double.empty(0,3);

line_ex = 1;

while all(line_ex ~= -1)

line_ex = fgetl(fileID)

if ischar(line_ex)

line_ex = sscanf(line_ex,'%f');

if length(line_ex) == 3

% line_ex = str2num(line_ex);

% if size(line_ex,2) == 3

data(end + 1,:) = line_ex;

end

end

end

fclose(fileID);

Sanwar