diagonal matrix

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noun Mathematics.

a square matrix in which all the entries except those along the diagonal from upper left to lower right are zero.

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Origin of diagonal matrix

First recorded in 1925–30

The young man weaves through clusters of bamboo and cuts a diagonal slash into a tree, positioning a hollow log at the end.
The Congo's Forgotten Colonial Getaway|Nina Strochlic|December 18, 2014|DAILY BEAST
So we sneaked The Matrix and the movie they gave us after was 10 Things I Hate About You.
Joseph Gordon-Levitt on ‘Sin City’ and Why He Considers Himself a Male Feminist|Marlow Stern|August 14, 2014|DAILY BEAST
But early on, his fictional people so often took the easy diagonal cut for betrayal.
Don Carpenter Was a Novelist Both Lacerating and Forgiving|Louis B. Jones|July 14, 2014|DAILY BEAST
A long, diagonal cross from Marcelo saw the ball reach Hulk, who brought it down to his feet from the top of his monumental chest.
World Cup 2014 Nail-Biter: Host Country Brazil Defeats Chile on Penalty Kicks|Tunku Varadarajan|June 28, 2014|DAILY BEAST

There was the groundbreaking action/science-fiction franchise-maker, The Matrix.
Complaining Like It’s 1999: ‘Fight Club,’ ‘American Beauty,’ and the Revolt of the Cubicle Drone|Arthur Chu|June 3, 2014|DAILY BEAST
The matrix or die is placed in a power press and the records pressed from the material used in making the sound records.
The Wonder Book of Knowledge|Various
The pillars are strengthened against lateral yielding by horizontal and diagonal bracing.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3|Various
It was built at Chatham, from the design of Mr. Oliver Lang, of mahogany and on the diagonal principle.
Yachting Vol. 2|Various.
Construction: diagonal principle, Dantzic oak without, horizontal planking of Italian larch.
Yachting Vol. 2|Various.
At the left of the doorway, a bay window, also heavily curtained, is set into the diagonal wall.
Fifty Contemporary One-Act Plays|Various