Index in position 2 exceeds array bounds (must not exceed 1).

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mohammad mehio
mohammad mehio on 14 May 2022
Commented: Voss on 14 May 2022
I have txt file which is EMG signal
when I running it it gives me error from function called cut1
I give a and b
give me the value of a: 100
give me the value of b: 10000
this is the error
Index in position 2 exceeds array bounds (must not exceed 1).
Error in cut1 (line 2)
y=X(:,a:b);
below is cut1 function
function y=cut1(X,a,b)
y=X(:,a:b);
end
below is the main code
close all; clear all; clc;
for i= 1:7
eq1 = load ((['TBGEMGPATIENT',num2str(i),'.txt']))';
test=eq1;
fig1=figure;plot(test)
title ('original signal');
xlabel ('time (sec)');
ylabel ('Amplitute (V)');
% dcm_obj = datacursormode(fig1);
% set(dcm_obj,'DisplayStyle','datatip',...
% 'SnapToDataVertex','off','Enable','on')
% a1= getCursorInfo(dcm_obj)
a= input('give me the value of a: ');
b= input('give me the value of b: ');
z=cut1(test,a,b);
signal=z;
s=size(signal);
b=s(1)*s(2);
x=reshape(signal,[1,b]);
y1=x';
% y1=y1(2000:8000,:);
y1=y1-mean(y1);
end
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Answers (1)

Voss
Voss on 14 May 2022
"Index in position 2 exceeds array bounds (must not exceed 1)."
This error message means the code is trying to access a column ("Index in position 2") that doesn't exist in that variable ("exceeds array bounds") because the variable has one column ("(must not exceed 1)").
The variable is X in this case, and you've told us that a is 100 and b is 10000. So X(:,a:b) is the 100th through 10000th columns of X. But the error says X has only one column.
The solution might be to change X so that it has at least 10000 columns, or the solution might be to change the indexing to access the 100th through 10000th elements of X, i.e., X(a:b)
  2 Comments
Voss
Voss on 14 May 2022
So now it's like this?
eq1 = load('TBGEMGPATIENT.txt')';
That's a different file than was used before. Maybe that file has 10000 columns instead of 1.

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