help with looping the fopen and fclose to draw a continuous graph

hey,

i have 288 files which contain 6050 lines, out of which first 50 lines are textual data

and from 50th line to 6000 lines is x,y,z coordinate data, i have to extract data of x,y,z from all the 288 files so that i can draw a continuous plot of x,y,z on after the other.

data files are named 1_1, 1_2, 2_1, 2_2 etc etc

clear all
clc
files = dir('1_1.txt') ;
fid = fopen( '1_1.txt' );
cac = textscan(fid,'%f%f%f', 'Headerlines',50, 'CollectOutput',true );
fclose( fid );
num = cac{1};
x = num(:,1);
y = num(:,2);  
plot(x,y) 

i wrote this logic for the first set of data but im not able to loop this to extract the continuous plot. can someone help me?

thank you

[dpb]

Is the order of processing files significant?

What is the naming convention when get past one-digit numbers? Sorting is going to be painful, perhaps...

[Likitha TG]

its an hourly testing data,

so 1_1 denotes the data at the start of the hour

1_2 denotes the data at the 50 th min

2_1 denotes the start of the second hour and so on

[dpb]

So, what happens in numbering system between hour 9 and 10, minute 9 and 10, ... ?

>> for i=1:15,fid=fopen(num2str(i,'1_%d.txt'),'w');fid=fclose(fid);end
>> d=dir('1_*.txt');
>> {d.name}.'
ans =
  15×8 char array
    '1_1.txt '
    '1_10.txt'
    '1_11.txt'
    '1_12.txt'
    '1_13.txt'
    '1_14.txt'
    '1_15.txt'
    '1_2.txt '
    '1_3.txt '
    '1_4.txt '
    '1_5.txt '
    '1_6.txt '
    '1_7.txt '
    '1_8.txt '
    '1_9.txt '
>> 

Answer 1

[Kavya Vuriti]

If the order of processing is not important, then you can use dir function to list all the files in a folder. Output of this function is a structure which has a field “name”. This field can be used in fopen function to open the file. Then extract the data using textscan function. To get a continuous plot, store the x and y values extracted from the files in arrays “x” and “y” and plot them after the loop terminates. You can also try using hold on command to get plot in the same figure window with same axes.