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190
2012 Oct 18
7
summation coding
I would like to code the following in R: a1(b1+b2+b3) + a2(b1+b3+b4) +
a3(b1+b2+b4) + a4(b1+b2+b3)
or in summation notation: sum_{i=1, j\neq i}^{4} a_i * b_i
I realise this is the same as: sum_{i=1, j=1}^{4} a_i * b_i - sum_{i=j} a_i
* b_i
would appreciate some help.
Thank you.
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2018 Dec 26
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2014 Oct 09
3
cambiar un valor por NA en data frame
...-2011
3 15 1 2101 2 B169 09-06-2011
16 15 1 7301 7 B169 23-07-2011
29 999 1 9201 9 B169 19-07-2011
20 15 2 8301 8 B169 02-08-2011
9 15 1 13125 13 B181 21-07-2011
3 15 1 2101 2 B181 23-12-2011
3 16 1 2101 2 B181 23-12-2011
11 999 1 13201 13 B181 05-09-2011
6 14 1 5101 5 B189 21-09-2011
5 14 2 4102 4 B190 15-09-2011
2 14 1 1101 1 B199 02-02-2011
14 16 1 13111 13 B199 17-02-2011
14 15 1 13201 13 B199 25-02-2011
13 15 2 13121 13 B199 24-02-2011
14 14 1 13201 13 B199 13-03-2011
11 14 1 13106 13 B199 13-03-2011
11 14 1 13101 13 B199 31-03-2011
21 15 1 9121 9 B199 23-03-2011
21 16 2 9111 9 B199 23-03-201...