Problem 56060. Sub-Diagonal Sum
Given a (m x n) matrix and a value r {1,-1}, change every element to the sum of the diagonal led by the element.
r=1 > regular diagonal (top left to bottom right)
r=-1 > flipped/cross diagonal (top right to bottom left)
in=[1 2 3 4
5 6 7 8
1 3 2 0]
r=1
out=[9 9 11 4
8 8 7 8
1 3 2 0]
%explaination
(1,1) diagonal - [1 6 2], sum = 9
(1,3) diagonal - [3 8], sum = 11
(2,1) diagonal - [5 3], sum = 8
(2,4) diagonal - [8], sum = 8
in=[1 -2 3 -4
5 -6 7 -8
1 3 -2 0]
r=-1
out=[1 3 -2 6
5 -5 10 -10
1 3 -2 0]
%explaination
(1,1) diagonal - [1], sum = 1
(1,3) diagonal - [3 -6 1], sum = -2
(2,2) diagonal - [-6 1], sum = -5
(2,4) diagonal - [-8 -2], sum = -10
Solution Stats
Problem Comments
Solution Comments
Show commentsProblem Recent Solvers8
Suggested Problems
-
5888 Solvers
-
Numbers with prime factors 2, 3 and 5.
466 Solvers
-
Create a square matrix of multiples
467 Solvers
-
Return elements unique to either input
761 Solvers
-
Calculate the Number of Sign Changes in a Row Vector (No Element Is Zero)
664 Solvers
More from this Author31
Problem Tags
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!