Index in position 2 exceeds array bounds (must not exceed 1). Error in cut1 (line 2) y=X(:,a:b);

when I run the main code I got this problem

close all; clear all; clc;
for i = 1:7
    test=load ((['TBGEMGPATIENT',num2str(i),'.txt']))';
    fig1=figure;plot(test);
    title ('original signal');
    xlabel ('time (sec)');
    ylabel ('Amplitute (V)');
    
    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-mean(y1);
    
    
    y1 = detrend(y1);
    N = length(y1);% find the length of the data per second
    ls = size(y1); %% size
    f = 1/N;% find the sampling rate or frequency
    fs = 1000;
    T = 1/fs; % period between each sample
    t1 = (0 : N-1) *T;%t = (0:1:length(y1)-1)/fs; % sampling period
    Nyquist = fs/2;
    figure;
end
%this is the code for cut1:
function y=cut(X,a,b)
y=X(:,a:b);
end

what should I do for y = X(:,a:b)? because when I added for end I start to have this problem

[Torsten]

After the line

test=load ((['TBGEMGPATIENT',num2str(i),'.txt']))';

insert

class(test)
size(test)

What do you get as output ?

And what are your usual inputs for a and b ?

And is "cut" the same as "cut1" ?

[mohammad mehio]

the signal is emg signal 10000 ms I cut first 100 so a is 100 and b is 10000

[mohammad mehio]

the problem is with cut1 function?

[mohammad mehio]

I added class (test)

size (test)

still the same error

[mohammad mehio]

I think cut1 function should have several rows or something like that

[Jan]

@mohammad mehio: The idea of "class(test), size(test)" is, to show the readers, what the type and size of the array is. Of course this does not fix the problem, but it helps you to post the relevant details here.

So please follow Torsten's instructions:

% insert
class(test)
size(test)
% What do you get as output ?

I guess, that test is a column vector of the size [N x 1] and you try to cut it along the 2nd dimension.

If so, use:

y = X(a:b);

[mohammad mehio]

yes it worked, thank you so much