What is wrong with my Matlab code? Index out of bounds [closed]

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I'm trying to read in a text file that contains nmea strings! But I get

??? Attempted to access y(1); index out of bounds because numel(Longitude)=0.
Error in ==> filter at 16
Loc(:,i)=coordinates(x(i),y(i))';

filter.m

clear all
A=textread('xxx\x.txt','%s','headerlines',1);
 for i=1:30;
n=2*i-1;
A(i)=A(n);
end
b=A(1:30,:);
c=char(b);
x=c(:,17:24);
y=c(:,28:36);

I can't figure out why it is wrong?!!

---

You cut out the wrong part of the string and end up with the ,N, part in the beginning (and also no decimals). I believe you want

Longitude=c(:,31:42);%Extract Longitude Array

---

Longitude=c(:,28:36);%Extract Longitude Array

My guess is that c(:,28:36) is empty which implies A might be empty too.

---

A is empty. Use TEXTSCAN instead:

>> fid = fopen('C:\Users\myself\Desktop\2.txt', 'rt');
>> A = textscan(fid, '%s');
>> A = A{1};
>> fclose(fid);