How can I fix "Index in position 2 exceeds array bounds" in for loop ?

Code:

A= datafile

sumArray = [];

for c = 1:length(A)

col = A(:,c);

sum1 = rms(A(:,c));

sumArray = [sumArray,sum1];

end

s=sumArray'

Attached file = A

Error : Index in position 2 exceeds array bounds (must not exceed 11).

Answer 1

[CHIRANJIT DAS]

@Rajeev Kumar You are giving dimension of row in the for loop. Perhaps you can replace length(A) with size(A,2). Revised code looks like the below one..

sumArray = [];
for c = 1:size(A,2)
   col = A(:,c);
   sum1 = rms(A(:,c)); 
   sumArray = [sumArray,sum1];
end
s=sumArray'

Cheers

[Rajeev Kumar]

This code works, thanks

Answer 2

[Askic V]

This is because you're not using length correctly. In fact it is not a good idea to use length when working with matrices.

In your special case, please have a look at the code:

load A.mat
% A is a matrix with dimensions: 1024x11
[nrRows, nrCols] = size(A)
ll = length(A)

I hope you understand now. You have only 11 columns in a matrix, but you're trying to iterate loop from 1 to 1024, where in fact 1024 is the number of rows.

Answer 3

[Joan]

W=cell(p,1);

for j=1:(p-1);

w=A(index(j):index(j+1)-2);

W{j}=w;

W2=cell(p,1);

for j=1:(p-1);

w2=A(index(j):index(j+1)-2);

W2{j}=w2

end

Z=

cell

(p,1);

for ii=1:p

P1=W{ii,1};

Z{ii,1}=P1(3:3:end);

end

for ii=1:p

P2=Z{ii,1};

if P2(end,1)>0

W2(ii,1)={[]};

end

end