copying every nth line and duplicating it on it's following line

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Chace
Chace 2013-10-31
评论： Cedric 2013-10-31
I am trying to make test files for the project, and I figured in order to make a bradycardia test file from an example file of a normal ECG. therefore I would need to copy every third line and insert it into the next line.
for example:
a =
[1 2 3 4 5 6 7 8 9 10]
and I want:
b=
[1 2 3 3 4 5 6 6 7 8 9 9 10]
and so on... but since the file is 6000 characters long, obviously i cannot manually copy it. And I need it to be 9000 characters long I've tried looking online on how to do this, and am having no luck. Any suggestions?

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Cedric
Cedric 2013-10-31
编辑：Cedric 2013-10-31
Here is an example where I display the output so you can see each step:
>> a = [1 2 3 4 5 6 7 8 9 10 11 12]
a =
1 2 3 4 5 6 7 8 9 10 11 12
>> tmp = reshape( a, 3, [] )
tmp =
1 4 7 10
2 5 8 11
3 6 9 12
>> tmp = [tmp; tmp(end,:)]
tmp =
1 4 7 10
2 5 8 11
3 6 9 12
3 6 9 12
>> b = tmp(:).'
b =
1 2 3 3 4 5 6 6 7 8 9 9 10 11 12 12
The only limitation is that the length of a must be a multiple of 3. If it's not the case, you can complete/pad with e.g. NaNs to meet this criterion, and replace the last line which defines b with
>> b = tmp(~isnan(tmp)).'
Let me know if you need to find an automatic way to complete with NaNs.

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