fopen and fget reading lines from a text

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Sergio
Sergio 2024-2-2
评论： Stephen23 2024-2-2
Hi, I try to work with fget and fopen, and I would like to read the first three lines from a text file (attached), and print them on the MATLAB output,
I try
fid = fopen('test.txt');
line_ex = fgetl(5) % read line excluding newline character
fid = fopen('test.txt');
line_ex = fgetl(5) % read line excluding newline character
fid = fopen('test.txt');
line_ex = fgetl(5) % read line excluding newline character
However, this prints out only the three first lines one time, then it continues to 4,5,6, then 7,8,9 etc.
Is there a better way to simply reproduce the three first lines of the text files, with the same command, over again?
Thanks

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采纳的回答

Dyuman Joshi
Dyuman Joshi 2024-2-2
编辑：Dyuman Joshi 2024-2-2
Ran in:
You need to use the file ID as input to fgetl -
fid = fopen('test.txt');
%lines to read
num = 3;
%Preallocate a cell array to store the data
C = cell(num,1);
for k=1:num
%Read the line
str = fgetl(fid);
%Store it in a cell element
C{k} = str;
%Display it
disp(str)
end
X-412.538 Y-150.417 Z505.02 B21=-24.976 A1=19.761 C0. X-412.313 Y-151.044 Z505.02 B21=-24.98 A1=19.85 C0. X-412.087 Y-151.67 Z505.02 B21=-24.984 A1=19.938 C0.
C
C = 3×1 cell array
{'X-412.538 Y-150.417 Z505.02 B21=-24.976 A1=19.761 C0.'} {'X-412.313 Y-151.044 Z505.02 B21=-24.98 A1=19.85 C0.' } {'X-412.087 Y-151.67 Z505.02 B21=-24.984 A1=19.938 C0.' }
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Dyuman Joshi
Dyuman Joshi 2024-2-2
Okay.
But it's not a good idea to hard code values. Better to store it as a variable and use it accordingly.
Stephen23
Stephen23 2024-2-2
"that File ID was given as 5"
Do not hard-code the File ID.

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