MATLAB Answers

Modify Repmat function to concatenate array

3 views (last 30 days)
Hello MathWorks community.
I'm trying to concatenate an array of my own "n" times. The thing is that each time each time I concatenate the array, I want to multiply it by 1, 10, 20...
For example, lets say my initial array is [0,1,2,3,4]. And that n =3. Then the output should look like:
out = [0,1,2,3,4,0,10,20,30,40,0,20,40,60,80]
I was wondering if I could use the repmat fucntion in some way to get this don, or is this function only useful for concatanating the exact same array?
Thank's for the help!

Accepted Answer

Stephen on 9 Feb 2021
V = [0,1,2,3,4];
n = 3;
X = [1,10*(1:n-1)];
Z = kron(X,V)
Z = 1×15
0 1 2 3 4 0 10 20 30 40 0 20 40 60 80
  1 Comment
Santos García Rosado
Santos García Rosado on 9 Feb 2021
Didn't know about that function. Thank you Stephen.

Sign in to comment.

More Answers (1)

Monika Jaskolka
Monika Jaskolka on 9 Feb 2021
If you want to understand how repmat works, take a look at the syntax and description in the documentation page:
I was able to do this using a loop:
n = 3;
init = [0, 1, 2, 3, 4];
out = init;
for i = 1:n-1
factor = 10*i;
out = horzcat(out, init.*factor);
  1 Comment
Santos García Rosado
Santos García Rosado on 9 Feb 2021
Thank's Monika, the loop works aswell. I've read the documentation but still acan't figure out a way.

Sign in to comment.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by