Delete a row from a matrix and save it in a new matrix

Hi Everyone

I have a matrix lets say 10*10

I just want to remove a row from the matrix(this is done using

A(2,:) = []

where A is the matrix and 2 is the number of row to be removed

I just want to learn how to save the removed row i.e 2nd row in a new matrix.

Thanks in advance

Answer 1

[Guillaume]

Just copy the row before deleting it. After you've deleted it, it's gone for good and can no longer be retrieved.

B = A(2, :);
A(2, :) = [];

Answer 2

[Walter Roberson]

saved_row = A(2,:);
A(2,:) = [];

There is no way to do this in one step, but you could write a function for it

function [A, removed] = delete_rows(A, whichrow)
   removed = A(whichrow, :);
   A(removed,:) = [];
end

and then

[A, saved_rows] = delete_rows(A, [2 19]);