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

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

[Torsten]

"test" seems to be a column vector. So it makes no sense to reference

test(:,100:10000)

in function "cut1".

[mohammad mehio]

when I removed for and remove num2str

it worked normally

Answer 1

[Voss]

"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)

[mohammad mehio]

when I removed for and remove num2str

it worked normally

[Voss]

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.