feof to loop through lines of data?

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David Phung
David Phung 2014-12-5
编辑： per isakson 2014-12-7
Hey, so i'm supposed to have a file called xypts with data like below where everything is spaced one apart.
z 0 y 1
z 4.6 y 2.2
z 6.8 y 6
z 8.1 y 7.4
I have to use a while loop and fgetl to read each line as a string. In the loop, it creates z and y vectors for the data points. It will loop until the end of the file is reached. The number of points should be in the plot title.
  2 个评论
Image Analyst
Image Analyst 2014-12-5
OK. Good luck with that. There are examples in the help for fgetl() and sscanf() to help you.
David Phung
David Phung 2014-12-6
编辑：Geoff Hayes 2014-12-7
I must've deleted the rest of my question on accident... but I was wondering why my feof was only giving me one data point, and then I figured it out. I just had to add a counter, n.
Here is my code:
clear all; clc
fid=fopen('xypts.csv');
n=1;
if fid== -1
disp('File open not successful')
else
while feof(fid)==0
aline=fgetl(fid);
string = strsplit(aline);
zvec(n)=(string(2));
yvec(n)=(string(4));
n=n+1;
end
z=str2double(zvec);
y=str2double(yvec);
zlength=length(z);
plot(z,y,'*')
plottitle=sprintf('%d number of points',zlength);
title=(plottitle)
close=fclose(fid);
if close == -1
disp('File close not successful')
else
disp('File close successful')
end
end

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