Problem 308. Matrix with different incremental runs

Created by Julio

Solve Later

Given a vector of positive integers a (>=0); How does one create the matrix where the ith column contains the vector 1:a(i) possibly padded with zeros:

in->a = [3 2 4];

out->b = [1 1 1;2 2 2;3 0 3;0 0 4];

Solve

Solution Stats

Last solution submitted on Apr 09, 2019

Last 200 Solutions

Problem Comments

Solution Comments

Solution 37925

1 Comment

1 Comment

Julio on 12 Feb 2012

yes of course. Leading solution:
function b = matInc(a)
[b aa] = ndgrid(1:max(a), a);
b(b > aa) = 0;
end
regards,

Problem Recent Solvers91

More from this Author10

Create a matrix X, where each column is a shifted copy of the vector v

111 Solvers
Matrix which contains the values of an other matrix A at the given locations.

193 Solvers
Remove NaN ?

600 Solvers
vectorization in N

193 Solvers
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4

122 Solvers

Problem Tags

logical matrix

Trial software