Description Usage Arguments Details Value Examples
View source: R/f0.rbsb1.code.r
returns a vector of indices of x
such that this is explored in
systematic way by nb
draws, spaced of kk
according to
its order.
Even is ord
is not "random", a call to
sample
is done so it is advised to call first set.seed
.
1 | systematic(x, nb, kk, ord="random")
|
x |
The vector to systematically sample. |
nb |
desired number of draws. |
kk |
frequency of successive draws. Something giving
quasi-uniform draw is is |
ord |
indicates which type of ordering must be done on the
output: |
When nb*kk
is less than length(x)
then the sequence is
1, kk+1, 2*kk+1,..., (nb-1)*kk+1 taking into account the ordered
order of values of x
. If not either look at the code or
experiment the function.
A vector of length nb
of indices of x
.
1 2 3 4 5 6 7 8 9 | rbsb3k("reset"); # only necessary for R checking
systematic(1:20, 5, 1);
systematic(1:20, 5, 3);
systematic(1:20, 15, 3);
systematic(1:20, 15, 3, "order");
systematic(1:20, 15, 3, "random");
sort(systematic(1:20, 55, 3));
uu <- c(2*(1:10), 1+2*(0:9));
uu[systematic(uu, 20, 3)];
|
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