how to create this vector [ 10 9 10 9 ...] with one command

hi can you help us to create this vector with one command v=[10 9 10 9 ...] 100 times with one command only

and how to create this vector =[ 1 1 2 2 3 3 4 4] with only one command !!

also how to create this with only one command =[ 1 1 2 2 1 1 2 2]

and finally this vector =[ -1 1 -2 2 -3 3 -4 4]

thank you guys :-) !!

[Jan]

What does "one command" exactly mean? Please not that for "v = [10, 9]" you call subsasgn and horzcat already.

We do not solve homework questions, but we like to assist you to solve them by your own. Please post, what you have tried so far and explain the occurring problems.

[Malak]

Its not a homework im studying for a final exam and im trying every possible way to create these kinds of vectors I tried these functions ..... repmat and for example a=zeros(1,100) >> a(1:2:99)=10 a(2:2:100)=8 a.*-1.*(-1).^[1:100] to get 10 -8 10 -8 ..and so on

Answer 1

[Youssef Khmou]

hi, try :

 v=repmat([10 9]',[50 1]);

[Malak]

Do you know how to repeat two different numbers like 11 22 or repeat four different numbers

[Youssef Khmou]

same way : repmat([1 2 3 4]',[4 1]) % 4 times

Answer 2

[Jan]

Never forget the really obvious solution:

v = [10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, ...
     10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, ...
     10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, ...
     10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, ...
     10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, ...
     10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, ...
     10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, ...
     10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, ...
     10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, ...
     10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9, 10, 9];

 w = [ 1 1 2 2 3 3 4 4]
 x = [ 1 1 2 2 1 1 2 2]
 y = [ -1 1 -2 2 -3 3 -4 4]

There are less efficient solutions based on the commands repmat or kron.

[Malak]

I know the obvious solution, but I can't use it in the final

[Jan]

Then, Malak, please explain this in your question. It is not a good idea to expect, that the readers can guess, what you need.