repeating an index number n times in a vector

Hi People,

I'd like to transform a vector p like this one. p=[3 0 2 2 1 0 3]

Into a new vector that has n times the indexnumber of n, for example:

new vector: v=[1 1 1 3 3 4 4 5 7 7 7] so it has 3 times 1, zero times 2, 2 times 3 and so on.

the numbers generated in p are variable but are always between 0 and 15

I hope you can help me.

Regards, Siem

Answer 1

[Amit]

v = [];
count = 1;
for j = 1:length(p) 
  if p(j) ~= 0
    v(count:count+p(j)-1) = j*ones(p(j),1);
    count = count + p(j);
  end
end

[Siem Nijskens]

Hi Amit,

Thank you so much this has been driving me crazy but your solution works perfectly.

Regards, Siem

Answer 2

[Chris]

Hey Siem,

I would do it like this:

v = p .* 1:length(p);

[Siem Nijskens]

Hi Cris,

Thanks for answering my question, unfortunately your solution didn't work.

Regards, Siem