# [R] Convert a character to numeric

Alfredo Cortell @||redo@corte||@n|co|@u @end|ng |rom gm@||@com
Tue Apr 9 16:35:35 CEST 2019

```Hi Bienvenue,

I believe that your problem is that R can't translate "one" to a number,
because it is not a number. R could translate to numeric for example this
vector, where numbers are expressed as strings,

c("1","4","7")

but "one" is just letters put together, therefore R can't understand their
meaning, and returns NA.

I believe that your best shot is to go with gsub, so that you translate
your "string letters" to "string numbers", and then you can do as.numeric
no problem

Try this

vec<-c("1",NA,"one")
num_vec<-gsub("one",1,vec)
num_vec<-as.numeric(num_vec)

Good luck,

Alfredo

El mar., 9 abr. 2019 a las 15:07, Duncan Murdoch (<murdoch.duncan using gmail.com>)
escribió:

> On 09/04/2019 7:30 a.m., Jim Lemon wrote:
> > Hi Bienvenue,
> > Perhaps you should ask whether you really want to "sort it out". The
> > warning is telling you that you are converting the NA values to NA in
> > the returned numeric vector.
>
> I don't think that's what it is saying.  I think it is saying that a
> non-NA value is being converted to NA, because R can't figure out what
> number it is.  For example,
>
>  > as.numeric(c("1", NA))
> [1]  1 NA
>  > as.numeric(c("1", NA, "one"))
> [1]  1 NA NA
> Warning message:
> NAs introduced by coercion
>
>
>   I can't think of anything more sensible
> > to do with NA values. You may also have character strings that cannot
> > be converted into numbers, which will also generate NA values.
>
> I think that's the only way that message will appear.
>
> Duncan Murdoch
>
>   Maybe a
> > little example will help us to understand:
> >
> > charstr<-c("5","foot","2",NA,"eyes","of","blue")
> > as.numeric(charstr)
> > [1]  5 NA  2 NA NA NA NA
> >
> > Jim
> >
> > On Tue, Apr 9, 2019 at 9:16 PM bienvenidozoma using gmail.com
> > <bienvenidozoma using gmail.com> wrote:
> >>
> >> Hi,
> >>
> >> I am applyin function as.numeric to a vector having many values as NA
> >> and it is giving :
> >> Warning message:
> >> NAs introduced by coercion
> >>
> >> Can anyone help me to know how to remove this warning and sor it out?
> >>
> >> Thanks
> >> Bienvenue
> >>          [[alternative HTML version deleted]]
> >>
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> >
>
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