Convert pH to/from Reaction Classes

ph_to_rxnclass(x, halfclass = FALSE, as.is = FALSE, droplevels = TRUE)

rxnclass_to_ph(x, halfclass = FALSE, digits = 2, simplify = TRUE)

ReactionClassLevels(halfclass = FALSE, as.is = FALSE)

Arguments

x: input pH values (numeric; ph_to_rxnclass()) or reaction classes (character; rxnclass_to_ph())
halfclass: Split the standard classes in half for higher resolution? Default: FALSE
as.is: logical. Should character vectors be converted to factors? Default: FALSE
droplevels: logical. Drop unused levels in factors? Default: FALSE
digits: Number of digits after decimal place; Default: 2. Used only for rxnclass_to_ph()
simplify: Simplify list result to numeric vector when length of result is 1? Default: TRUE

Value

ph_to_rxnclass(): a vector of reaction classes corresponding to numeric input in x; if as.is=FALSE an ordered factor using ReactionClassLevels()

rxnclass_to_ph(): a list of data.frame objects containing high/low values of reaction class 1:1 with input; if simplify=TRUE and input is a data.frame.

ReactionClassLevels(): ordered factor containing descriptive terms for reaction classes

Examples

ph_to_rxnclass(6.2)
#> [1] slightly acid
#> Levels: slightly acid
rxnclass_to_ph("slightly acid")
#>   pH_low pH_high
#> 1   6.05    6.55

rxnclass_to_ph(list(c("Slightly Acid", NA, "Moderately Acid"),
                    c("Slightly Acid", NA, "Strongly Acid")), simplify = FALSE)
#> [[1]]
#>   pH_low pH_high
#> 1   5.55    6.55
#> 
#> [[2]]
#>   pH_low pH_high
#> 1   5.05    6.55
#> 
ReactionClassLevels()
#>  [1] ultra acid             extremely acid         very strongly acid    
#>  [4] strongly acid          moderately acid        slightly acid         
#>  [7] neutral                slightly alkaline      moderately alkaline   
#> [10] strongly alkaline      very strongly alkaline
#> 11 Levels: ultra acid < extremely acid < ... < very strongly alkaline