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

2013 4 15
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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 :-) !!

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Jan
Jan 2013-4-15
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
Malak 2013-4-15
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

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Youssef Khmou
Youssef Khmou 2013-4-15
编辑：Youssef Khmou 2013-4-15

0 个投票

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

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Malak
Malak 2013-4-15
Do you know how to repeat two different numbers like 11 22 or repeat four different numbers
Youssef Khmou
Youssef Khmou 2013-4-15
same way : repmat([1 2 3 4]',[4 1]) % 4 times

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Jan
Jan 2013-4-15
编辑：Image Analyst 2013-4-15

0 个投票

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.

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Malak
Malak 2013-4-15
编辑：Image Analyst 2013-4-15
I know the obvious solution, but I can't use it in the final
Jan
Jan 2013-4-15
Then, Malak, please explain this in your question. It is not a good idea to expect, that the readers can guess, what you need.

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