increment | R Documentation |
Syntactic sugar for incrementing and decrementing likelihood functions
inc(H, val = 1)
dec(H, val = 1)
trial(winners,players,val=1)
H |
A hyper2 object |
winners , players |
Numeric or character vectors specifying the winning team and the losing team |
val |
Numeric |
A very frequent operation is to increment a single term in a hyper2 object. If
> H <- hyper2(list("b",c("a","b"),"c",c("b","c")),c(2,4,3,5)) > H a * (a + b)^4 * b^2 * (b + c)^5 * c^3
Suppose we wish to increment the power of a+b
. We could do:
H[c("a","b")] <- H[c("a","b")] + 1
(see the discussion of hyper2_sum_numeric
at
Ops.hyper2.Rd
). Alternatively we could use magrittr
pipes:
H[c("a","b")] %<>% `+`(1)
But inc
and dec
furnish convenient idiom to accomplish the
same thing:
H[c("a","b")] %<>% inc
Functions inc
and dec
default to adding or subtracting 1,
but other values can be supplied:
H[c("a","b")] %<>% inc(3)
Or even
H[c("a","b")] %<>% inc(H["a"])
The convenience function trial()
takes this one step further and
increments the ‘winning team’ and decrements the bracket
containing all players. The winners are expected to be players.
> trial(c("a","b"),c("a","b","c")) > (a + b) * (a + b + c)^-1
Using trial()
in this way ensures that the powers sum to zero.
The inc
and dec
operators and the trial()
function are used in inst/kka.Rmd
.
Robin K. S. Hankin
data(chess)
## Now suppose we observe an additional match, in which Topalov beats
## Anand. To incorporate this observation into the LF:
trial("a",c("a","b"))
chess <- chess + trial("Topalov",c("Topalov","Anand"))
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.