Hello, my programme is supposed to read data from a txt file and create plots. Everytime I run the programme, I get an error pasted at the bottom of the code. plz help. I ve attached te txt file also.

clear;
close all;

[filename, pathname] = uigetfile('*.txt','*');
  addpath(pathname);                                      % Read txt file from anywhere of the directories

XX = dlmread(filename,'\t',1,0);

Fs=200; % scan frequency (200) 
n=0.01:1/Fs:5; 

%%%%%READ LABVIEW TIME DOMAIN DATA AND STORE IN MATRIX %%%%%
xn=XX(:,1);

%%%%%PLOT POWER SPETRA %%%%%
window=boxcar(length(xn)); %¾ØÐδ° 
nfft=1024000; 
[Pxx,f]=periodogram(xn,window,nfft,Fs); %Ö±½Ó·¨ 

figure(1)
subplot(2,1,1)
plot(n,xn),Title('Acceleration-time history'),xlabel('Time(Sec)'),ylabel('Acceleration (g)')
%axis([0 5,-0.5 0.5]); 
grid
subplot(2,1,2)
plot(f,Pxx),Title('Acceleration spectrum'),xlabel('Frequency(Hz)'),ylabel('Normalised Acceleration^2/Hz')
axis([0 25,0 0.001]); 
text(16,0.0008,'14.64', 'FontSize',16)
grid

%GET THE NATURAL FREQUENCY%
pmax=max(Pxx(:,1));            %ÇóµÚ1ÁеÄ×î´óÖµ
fr=find(Pxx(:,1)>=pmax);       %ÕÒµ½×î´óÖµµÄÐкÅ
w=f(fr,:)                   %È¡¾ØÕóµÄÄÇÐÐ

%ERROR that i get:

>> programe
Error using dlmread (line 139)
Mismatch between file and format string.
Trouble reading number from file (row 1u, field 1u) ==> x,y,z,x,y,z,x,y,z,\n

Error in programe (line 7)
XX = dlmread(filename,'\t',1,0);

Answer 1

[Walter Roberson]

You are using dlmread() to read the file. dlmread() is only for numeric information. Line 139 of your file is the line

x,y,z,x,y,z,x,y,z,

which is not numeric.

You will need to remove that line, or you will need to change your program to not use dlmread()

[Munal]

Now there is a new error: >> programe Error using dlmread (line 139) Mismatch between file and format string. Trouble reading number from file (row 2u, field 1u) ==> ,-0.031052,-0.988647,0.007066,-0.009581,-0.985219,0.003722,-0.021470,-0.003429,\n

Error in programe (line 7) XX = dlmread(filename,'\t',1,0);

[Walter Roberson]

dlmread() is not suitable for files that have missing information. You will need to switch to textscan() instead

numcol = 10;
fmt = repmat('%f', 1, numcol);

fid = fopen(filename, 'rt');
datacell = textscan(fid, fmt, 'Delimiter', ',', 'EmptyValue', nan, 'CollectOutput', 1);
fclose(fid);
XX = datacell{1};

This will put nan in each of the places that data was not available.