Created
February 27, 2015 20:48
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| > a | |
| [1] 1 2 3 4 | |
| > b | |
| [1] -1 | |
| > c = rep(a, each=2) | |
| > c | |
| [1] 1 1 2 2 3 3 4 4 | |
| > c[seq.int(from=2, to=length(c), by=2)] = b | |
| > c[1:length(c)-1] | |
| [1] 1 -1 2 -1 3 -1 4 |
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