(Anti)diagonal automation

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GEORGIOS BEKAS
GEORGIOS BEKAS 2018-2-17
评论： Kaouthar Bouyaouzan 2021-2-3
Counting from the top right element to the the bottom left element of an indicative 5x5 matrix, is there a quick way to automate the simulation of all the antidiagonals?
a(1,1) =1
a(2,1) =2
a(1,2) =2
a(3,1)= 3
a(2,2)=3
a(1,3)=3
a(4,1)=4
a(2,3)=4
a(3,2)=4
a(1,4)=4
a(1,5)=5
a(4,2)=5
a(3,3)=5
a(2,4)=5
a(5,1)=5
a(5,5)=1
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John D'Errico
John D'Errico 2018-2-17
编辑：John D'Errico 2018-2-17
Sigh. I know what an anti-diagonal is.
What you have not said is what is your goal. You filled only the first 5 anti-diagonals. Then you stuffed the (5,5) element with a 1. So what are you looking to get? Why did you not fill the other ant-diagonals? How do we know what you are looking for here?
Finally, what does it mean to SIMULATE anti-diagonal?
GEORGIOS BEKAS
GEORGIOS BEKAS 2018-2-17
how can I take the elements of all antidiagonals from any matrix?

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回答（1 个）

Steven Lord
Steven Lord 2018-2-17
Flip the matrix using the flip function then call diag.
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Roger Stafford
Roger Stafford 2018-2-17
The second argument in the 'diag' function provides for the smaller diagonals, which "flipped" would be the smaller anti-diagonals.

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