Hi Rui Barradas
thank you very much, that's what I searched for
result <- lapply(conds, fun, DF) works, if
day <- DF$day
val <- DF$val
Thanks
Christof
Am 02-07-2012 20:44, schrieb Rui Barradas:
> Hello,
>
> I'm not sure if this is what you want.
>
>
> #-------------- Make up a dataset
> set.seed(1)
> n <- 1e2
> DF <- data.frame(year=2010 + sample(3, n, TRUE),
> day=sample(365, n, TRUE),
> val=sample(100, n, TRUE))
>
> a = "day > 100"; b = "val < 50"; c = "year == 2012"
> conds <- list(a=a, b=b, c=c)
>
> #-------------- This does it
> fun <- function(condition, x){
> f <- function(){}
> if(class(x) == "matrix") x <- data.frame(x)
> if(class(x) == "data.frame")
> body(f) <- with(x, parse(text=condition))
> else
> body(f) <- parse(text=condition)
> f()
> }
>
> #-------------- Test the function
> year <- DF$year # See if it works with vectors
> fun(b, year) # Must throw error
> fun(c, year) # Should work
>
> # And now with data.frames
> result <- lapply(conds, fun, DF)
>
> Reduce(`&`, result) # combine the results
> Reduce(`|`, result) #
>
>
> Hope this helps,
>
> Rui Barradas
>
> Em 02-07-2012 18:04, Christof Kluß escreveu:
>> Hi
>>
>> how would you save conditions like
>>
>> a = "day > 100"; b = "val < 50"; c = "year == 2012"
>>
>> in a list? I like to have variables like "day", "val", "year" and a list
>> of conditions list(a,b,c). Then I want to check if a & b & c is true or
>> if a | b | c is true or similar things.
>>
>> Greetings
>> Christof
>>
>> ______________________________________________
>> R-help@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
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