Assume A is a 5-by-5 matrix. A([2,4],:) =  is a quick way to remove rows 2 and 4. Can you find a quick way to insert rows into A?
You are given a n-by-m matrix A, a 1-by-p vector of indices IND, and either a scalar value (1-by-1) or a p-by-m matrix b to be inserted AFTER rows IND of A. In case of a scalar value it should fill the whole row. Note that IND may contain duplicate indices, which means that more than one row should be inserted after that specific row index.
A = [1 1; 3 3; 4 4]; IND = [1 3]; b = [2 2; 5 5];
y = [1 1; 2 2; 3 3; 4 4; 5 5];
A = [0 0; 1 1]; IND = [1 1 2]; b = NaN;
y = [0 0; NaN NaN; NaN NaN; 1 1; NaN NaN];
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