This converts strings to unit objects. Only a few strings are recognized, because most oce functions have specialized unit vocabularies and so have little need of this function.
as.unit(u, default = list(unit = expression(), scale = ""))A character string indicating a unit. Case is ignored, so that e.g.
"dbar" and "DBAR" yield equal results. The following are recognized:
c("m-1", "dbar", "decibar", "degree", "degree_Celcius",
"degree_north", "degree_east", "ipts-68",
"its-90", "m/s^1", "m/s^2", "pss-78",
"umol/kg", "micromole/kg")
A default to be used for the return value, if u
is not a recognized string.
A list with elements unit, an expression(),
and scale, a string.
as.unit("DBAR")
#> $unit
#> expression(dbar)
#>
#> $scale
#> [1] ""
#>
as.unit("IPTS-68")
#> $unit
#> expression(degree * C)
#>
#> $scale
#> [1] "IPTS-68"
#>
as.unit("ITS-90")
#> $unit
#> expression(degree * C)
#>
#> $scale
#> [1] "ITS-90"
#>
as.unit("PSS-78")
#> $unit
#> expression()
#>
#> $scale
#> [1] "PSS-78"
#>
as.unit("UMOL/KG")
#> $unit
#> expression(mu * mol/kg)
#>
#> $scale
#> [1] ""
#>