I am in the process of translating all my algortihms that had previously
been written in APL into S, and I have several difficulties. Would be very
grateful if you can help:
Let's say there exists a, whereby a<-c(1,2,3,4,5,6,7,8,7).
(1) How do we drop the third element only, leaving a to be 1 2 4 5 6 7 8 7 ?
(2) How do we repalce the second element with vector c(10,11,12), yielding
the vector 1 10 11 12 3 4 5 6 7 8 7?
(3) How do we reverse the sequence of a, yielding 7 8 7 6 5 4 3 2 1?
(4) How do we rotate the vector forward by three place, yielding the vector
7 8 7 1 2 3 4 5 6?
(5) How do we rotate the vector backwards two places, yielding the vector
3 4 5 6 7 8 7 1 2?
(6) How do we select the 2nd, 3rd, and 4th element in the vector a so that
we can create two vectors a which is 1 5 6 7 8 7, and b which is 2 3 4?
Much obliged.
Lin
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Dr. L. Y. Hin
Department of Obstetrics & Gynaecology
Prince of Wales Hospital
Hong Kong SAR
Tel. (852) 2632 2807
Fax. (852) 2636 0008
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