How to delete elements from vector in for loop?

I have an A vector and I want to remove values less than the 0.1*max(A). Also I want to remove same rows in a B vector with respect to A:

size(B)= 801 1 size(A)=801 1

The error that I got is:

'A null assignment can have only one non-colon index.'

        for p=length(A):-1:1
            if A(p,1)<max(A)*0.1
                A(p,1)=[]; B(p,1)=[];
            end
        end

Answer 1

[Image Analyst]

Try this:

rowsToDelete = 0.1*max(A);
A(rowsToDelete) = [];
B(rowsToDelete) = [];

No loop needed.

The problem was that it was considering the array as a 2-D array because you included the ",1" in the indexing. And you can't delete just one element from a 2-D array because you can't have arrays with ragged edges. You have to delete a whole column or a whole row, not part of a row or column.

[Murat Yetkin]

this havent worked since the 'rowsToDelete' variable is not an integer. thank you.

[Andrei Bobrov]

rowsToDelete = A < 0.1*max(A);
A(rowsToDelete) = [];
B(rowsToDelete) = [];

[Image Analyst]

Thanks for the correction Andrei!