Modify Repmat function to concatenate array

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!

Santos

Answer 1

[Stephen23]

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

[Santos García Rosado]

Didn't know about that function. Thank you Stephen.

Answer 2

[Monika Jaskolka]

If you want to understand how repmat works, take a look at the syntax and description in the documentation page: https://www.mathworks.com/help/matlab/ref/repmat.html.

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); 
end

[Santos García Rosado]

Thank's Monika, the loop works aswell. I've read the documentation but still acan't figure out a way.