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I want to insert rows to matrix with condition

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mohammed sportman
mohammed sportman 2013-1-15
i have this matrix
D=[ 1 2 3 4 0 0
1 2 5 3 4 0
1 3 1 0 0 0
1 3 4 2 0 0
2 1 6 0 0 0
2 1 5 4 0 0
2 3 4 2 0 0
2 3 5 4 1 0
3 1 2 0 0 0
3 1 4 0 0 0 ]
i want to insert at each same raw ( same the 1&2 columns) for example
1 2 3 4 0 0
1 2 5 3 4 0
another raw (like 1&2 columns and 0 0 0 0)
1 2 0 0 0 0
for the matrix D become
D=[1 2 0 0 0 0
1 2 3 4 0 0
1 2 5 3 4 0
1 3 0 0 0 0
1 3 1 0 0 0
1 3 4 2 0 0
2 1 0 0 0 0
2 1 6 0 0 0
2 1 5 4 0 0
2 3 0 0 0 0
2 3 4 2 0 0
2 3 5 4 1 0
3 1 0 0 0 0
3 1 2 0 0 0
3 1 4 0 0 0 ]

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采纳的回答

José-Luis
José-Luis 2013-1-15
your_mat = sortrows([a;b]);

更多回答（1 个）

Image Analyst
Image Analyst 2013-1-15
Hint: You can get a submatrix like this:
subMatrix = fullMatrix(1:someRow, :);
subMatrix = fullMatrix(row1:row2, :);
subMatrix = fullMatrix(someRow:end, :); % End has a special meaning
(pick one), and you can concatenate matrices vertically like this:
tallMatrix = [shortMatrix1; shortMatrix2]; % Use as many as you want
They all have to have the same number of columns of course.
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Image Analyst
Image Analyst 2013-1-15
What do you mean "to first row of b"? Do you mean insert that row of a "before" or "after" the first row of b, or do you mean that you want the row should overwrite ( not "insert") that row of b?

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