R using ggplot2: "Error in value == "primary" : comparison is not allowed for expressions" -


i attempting change labels in handy facet plot available in r ggplot using function created, facet_labeller:

#this function map new name category labels facet_labeller <- function(var, value){   value <- as.character(value)    # creates labels superscript 1st , 2nd solvation shells   label_primary <- expression(1^{st} ~ shell)   label_secondary <- expression(2^{nd} ~ shell)    if (var=="solvent") {     value[value=="meoh"] <- "methanol"     value[value=="water"]   <- "water"   }   if (var=="shell") {     value[value=="secondary"] <- label_secondary     value[value=="primary"] <- label_primary   }   if (var=="ion") {     value[value=="cl"] <- "cl"     value[value=="na"] <- "na"   }   return(value) }

when function called facet_grid:

facet_grid(shell + ion ~ solvent, scales="free_y", labeller=facet_labeller)

i error "error in value == "primary" : comparison not allowed expressions"

i not understand @ why occurring. changing line cited error fix things , allow plot created; example, can comment line out, or can put string instead of 'label_primary' variable. need use expression, however, because of superscripts.

why happening? why doesn't happen 1 check in if block? how can work? appreciated - @ total loss.

the cause of error:

at beginning of function call, elements of value have class "character". when hit

    value[value=="secondary"] <- label_secondary

a bunch of elements replaced expressions. when try 

    value[value=="primary"] <- label_primary

r trying compare expressions strings, doesn't know how comparison expressions, complains , stops working.

how fix it:

try replacing block:

if (var=="shell") {     value[value=="secondary"] <- label_secondary     value[value=="primary"] <- label_primary }

with:

if (var=="shell") {     primary_values <- value=="primary"     value[-primary_values] <- label_secondary     value[primary_values] <- label_primary }

this checks each element once, before has been changed, avoids trying comparisons expressions.


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