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Delete line of file based on number in first column

Asked by Henrik Larsen on 5 Sep 2016
Latest activity Commented on by arvind ramasamy on 11 Jul 2018
I'm trying to delete lines in a file based on a number in the first "column" of the file. The file(s) looks something like:
8 Job Operator Date Time Instrument
8 15899-2016 THP/KVE 16-08-11 08:13:09 1626136
8
8 PT Code y X Z
6 CKOTE1 250 137827.548 98704.895 32.880
6 CKOTE2 250 137828.245 98707.396 32.880
6 CKOTE3 250 137830.581 98711.226 32.880
8 CKOTE4 250 137833.055 98713.677 32.879
So my questions is how i tell matlab to skip lines containing the char "8" in the first column, so I get the remaining data:
6 CKOTE1 250 137827.548 98704.895 32.880
6 CKOTE2 250 137828.245 98707.396 32.880
6 CKOTE3 250 137830.581 98711.226 32.880
Thanks

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1 Answer

Answer by Azzi Abdelmalek
on 5 Sep 2016
 Accepted Answer

fid=fopen('file.txt');
l1=strtrim(fgetl(fid));
out={};
while ischar(l1)
l2=strtrim(l1);
if l2(1)~='8'
out{end+1,1}=l1;
end
l1=fgetl(fid);
end
out

  2 Comments

I don't know if I need to make a new question, anyway here goes:
I can't make it work if forexample i just make an empty line like this:
8 Job Operator Date Time Instrument
8 15899-2016 THP/KVE 16-08-11 08:13:09 1626136
8 PT Code y X Z
6 CKOTE1 250 137827.548 98704.895 32.880
6 CKOTE2 250 137828.245 98707.396 32.880
6 CKOTE3 250 137830.581 98711.226 32.880
8 CKOTE4 250 137833.055 98713.677 32.879
This will just give me an out of bound error, I have tried to work it out myself but I just can get it to work.
Any suggestions?
I make a serial communication with an arduino and get the data of accelerometer mag and gyro values my data comes in as a string. 's' is the object i created for serial communication
data =fscanf(s,%s) % gives me the data from the arduino
i want my vector size to be 500. so when I run it in for loop
for i= 1:50
data =fscanf(s,'%s');
end
my output is: data = initializationsuccesful!
data = ax:123ay:23az:1234gx:23gy:50gz:43mx:23my:123mz:234
and goes on.
I use,
A_x(:,i) = str2num(data(:,4:8))
to get my vector. but since 'initializationsuccessful!' is not a number i am unable to form my vector. so how can I do it ???? this is my question

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