Problem 1972. Convert matrix to 3D array of triangular matrices
Given a 2D numeric array x in which each column represents the vectorized form of an upper triangular matrix, return a 3D array y containing the concatenated triangular matrices.
- If the size of the input matrix x is MxN, then the size of the output matrix y is PxPxN, where M = sum(1:P)
- You may assume that P<=100
Example
If
x = 1 7 13 2 8 14 3 9 15 4 10 16 5 11 17 6 12 18
then
y(:,:,1) = 1 2 4 0 3 5 0 0 6
y(:,:,2) = 7 8 10 0 9 11 0 0 12
y(:,:,3) = 13 14 16 0 15 17 0 0 18
NOTE: If you are wondering why this seems like a strange task, it is inspired by a genotype->phenotype mapping I am doing in a genetic algorithm.
Solution Stats
Problem Comments
Solution Comments
Show commentsProblem Recent Solvers103
Suggested Problems
-
205 Solvers
-
Create a Multiplication table matrix...
443 Solvers
-
1328 Solvers
-
Pernicious Anniversary Problem
817 Solvers
-
Matrix of Multiplication Facts
107 Solvers
More from this Author44
Problem Tags
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!