Description Usage Arguments Details Value Author(s) See Also Examples
Calculate a minimum for each period of INDEX. Essentially a rolling application of minimum over a series of non-overlapping sections.
1 | period.min(x, INDEX)
|
x |
a univariate data object |
INDEX |
a numeric vector of endpoints to calculate maximum on |
Used to calculate a minimum per period given an arbitrary index of sections to be calculated over. This is an optimized function for minimum. There are additional optimized versions for max, sum, and prod.
For xts-coercible objects, an appropriate INDEX
can be derived from a call to endpoints
.
An xts or zoo object of minimums, indexed by the period endpoints.
Jeffrey A. Ryan
endpoints
, period.sum
,
period.max
, period.prod
1 2 3 4 5 | period.min(c(1,1,4,2,2,6,7,8,-1,20),c(0,3,5,8,10))
data(sample_matrix)
period.min(sample_matrix[,1],endpoints(sample_matrix))
period.min(as.xts(sample_matrix)[,1],endpoints(sample_matrix))
|
Loading required package: zoo
Attaching package: 'zoo'
The following objects are masked from 'package:base':
as.Date, as.Date.numeric
3 5 8 10
1 2 6 -1
30 58 89 119 150 180
49.85477 50.22448 48.25248 48.90488 47.56210 47.19411
[,1]
2007-01-31 49.85477
2007-02-28 50.22448
2007-03-31 48.25248
2007-04-30 48.90488
2007-05-31 47.56210
2007-06-30 47.19411
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