Sections created with as.section() have "stations" that are in the
order of the CTD objects (or filenames for such objects) provided. Sometimes,
this is not the desired order, e.g. if file names discovered with
dir() are in an order that makes no sense. (For example, a
practioner might name stations "stn1", "stn2", etc., not
realizing that this will yield an unhelpful ordering, by file name, if there
are more than 9 stations.) The purpose of sectionSort is to permit
reordering the constituent stations in sensible ways.
sectionSort(section, by, decreasing = FALSE)A section object containing the section whose stations
are to be sorted.
An optional string indicating how to reorder. If not provided,
"stationID" will be assumed. Other choices are "distance", for
distance from the first station, "longitude", for longitude,
"latitude" for latitude, and "time", for time.
A logical value indicating whether to sort in decreasing order. The default is FALSE. (Thanks to Martin Renner for adding this parameter.)
object A section object that has been smoothed,
so its data fields will station-to-station variation than
is the case for the input section, x.
Other things related to section data:
[[,section-method,
[[<-,section-method,
as.section(),
handleFlags,section-method,
initializeFlagScheme,section-method,
plot,section-method,
read.section(),
section,
section-class,
sectionAddStation(),
sectionGrid(),
sectionSmooth(),
subset,section-method,
summary,section-method
library(oce)
data(section)
sectionByLongitude <- sectionSort(section, by = "longitude")
head(section)
#> Section 'a03' has 6 stations:
#> Index ID Lon Lat Levels Depth
#> 1 3 -8.526 36.876 5 202
#> 2 4 -8.620 36.719 16 742
#> 3 6 -8.738 36.538 19 1567
#> 4 7 -8.791 36.425 24 2349
#> 5 8 -8.901 36.250 23 2629
#> 6 9 -9.271 36.235 24 3842
head(sectionByLongitude)
#> Section 'a03' has 6 stations:
#> Index ID Lon Lat Levels Depth
#> 1 133 -73.673 38.237 8 154
#> 2 132 -73.605 38.205 13 843
#> 3 131 -73.491 38.158 16 1378
#> 4 130 -73.319 38.086 20 2024
#> 5 129 -73.156 38.004 22 2363
#> 6 128 -72.976 37.925 24 2574