saving data from text file which meets conditions

Hi, I am trying to save rows of data which meet the criteria that I am setting.

I have a large text file and trying to save the rows which meet conditons to preproces my data.

I am getting the error:

Error using norm

First argument must be single or double.

Error in remove_first_row (line 4)

if norm(xyData(i,2:4))>1E-3

Can anyone help?

xyData = ('ANNDB1.txt'); 
T = [];
for i = 1:length(xyData)
if norm(xyData(i,2:4))>1E-3
    if norm(xyData(i,8:10))>1E-3
        if norm(xyData(i,14:16))-norm(1,1,0)>1
            T = [T; xyData(i,:)]
        end
    end
    
end
end
P = table(T(:,1), T(:,2:4), T(:,5:7), T(:,8:10), T(:,11:13), T(:,14:16), T(:,17:19), 'VariableNames', {'t', 'U1', 'U2', 'V1', 'V2', 'R1', 'R2'});
writetable(T,'PrePANNDB1.txt')

[Mathieu NOE]

hello

so what is the class and dimension of xyData ?

[Mathieu NOE]

hello

problem solved ?

Answer 1

[Jan]

xyData = ('ANNDB1.txt'); 

Now xyData is the char vectpr 'ANNDB1.txt' . I guess, this is a file name. Then you have to import the contents of the file at first. Processing the name of the file is not useful. Maybe:

xyData = readtable('ANNDB1.txt');