[R] parsing problem
Gabor Grothendieck
ggrothendieck at gmail.com
Mon Feb 2 14:03:55 CET 2009
Try using dput when posting (which gives us):
dd <- structure(list(X2 = 3:6, Placebo = structure(c(2L, 3L, 4L, 1L
), .Label = c("1000mg/kg", "125mg/kg", "250mg/kg", "500mg/kg"
), class = "factor")), .Names = c("X2", "Placebo"), class =
"data.frame", row.names = c("1",
"2", "3", "4"))
# assuming dd above try this:
library(gtools)
mixedsort(dd$Placebo)[1]
On Mon, Feb 2, 2009 at 7:42 AM, Ken Knoblauch <ken.knoblauch at inserm.fr> wrote:
> Ken Knoblauch <ken.knoblauch <at> inserm.fr> writes:
>
>>
>> venkata kirankumar <kiran4u2all <at> gmail.com> writes:
>> > I am trying to parse a vector for caliculating minimum in that vector the
>> > vector having values like
>> >
>> > 1 Kontrolle
>> > 2 Placebo
>> > 3 125mg/kg
>> > 4 250mg/kg
>> > 5 500mg/kg
>> > 6 1000mg/kg
>> > hear i tries for comverting it into numeric with using "as.numaric()"
>> > function
>> > but i got values like
>> > 5
>> > 6
>> > 2
>> > 3
>> > 4
>> > 1
>> >
>> > can anyone suggest how I will solve it
>> >
>> > thanks in advance
>> >
>> > regards;
>> > kiran
>> >
>> Your Kontrolle is being treated as a factor so you
>> are seeing only the codes of the levels. There is
>> probably something more elegant, but you need
>> something like,
>>
>> as.numeric(sapply(with(dd, strsplit(levels(Placebo)[Placebo], "m")), "[[", 1))
>>
> I should have specified that when I read in your data, my data frame
> looked like this
> dd
> X2 Placebo
> 1 3 125mg/kg
> 2 4 250mg/kg
> 3 5 500mg/kg
> 4 6 1000mg/kg
> and
> str(dd)
> 'data.frame': 4 obs. of 2 variables:
> $ X2 : int 3 4 5 6
> $ Placebo: Factor w/ 4 levels "1000mg/kg","125mg/kg",..: 2 3 4 1
>
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