feof to loop through lines of data?

2 次查看（过去 30 天）

David Phung 2014-12-5

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/165515-feof-to-loop-through-lines-of-data

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
显示无隐藏无

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 2014-12-6

编辑：Geoff Hayes 2014-12-7

在 MATLAB Online 中打开

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