which.min
From base v3.3
by Rcore Rcore@Rproject.org
Where is the Min() or Max() or first TRUE or FALSE ?
Determines the location, i.e., index of the (first) minimum or maximum of a numeric (or logical) vector.
 Keywords
 utilities
Usage
which.min(x)
which.max(x)
Arguments
Value

Missing and NaN values are discarded.an integer or on 64bit platforms, if
length(x) =: n\ge 2^{31}>= 2^31 an integer
valued double of length 1 or 0 (iff x has no
nonNAs), giving the index of the first minimum or
maximum respectively of x.If this extremum is unique (or empty), the results are the same as
(but more efficient than) which(x == min(x, na.rm = TRUE)) or
which(x == max(x, na.rm = TRUE)) respectively.
Note
For a logical
vector x
with both FALSE
and
TRUE
values, which.min(x)
and which.max(x)
return
the index of the first FALSE
or TRUE
, respectively, as
FALSE < TRUE
.
See Also
Use arrayInd()
, if you need array/matrix indices instead
of 1D vector ones.
which.is.max
in package \href{https://CRAN.Rproject.org/package=#1}{\pkg{#1}}nnetnnet differs in
breaking ties at random (and having a ‘fuzz’ in the definition
of ties).
Examples
library(base)
x < c(1:4, 0:5, 11)
which.min(x)
which.max(x)
## it *does* work with NA's present, by discarding them:
presidents[1:30]
range(presidents, na.rm = TRUE)
which.min(presidents) # 28
which.max(presidents) # 2
## Find the first occurrence, i.e. the first TRUE, if there is at least one:
x < rpois(10000, lambda = 10); x[sample.int(50, 20)] < NA
## where is the first value >= 20 ?
which.max(x >= 20)
## Also works for lists (which can be coerced to numeric vectors):
which.min(list(A = 7, pi = pi)) ## > c(pi = 2L)
Community examples
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