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

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John Hock
John Hock 2019-5-1
回答： Walter Roberson 2019-5-1
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

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回答（2 个）

Guillaume
Guillaume 2019-5-1
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, :) = [];
Walter Roberson
Walter Roberson 2019-5-1
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]);

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