[R] [FORGED] If else

[Rolf Turner]

On 31/10/15 14:15, Val wrote:
> Hi all,
> Iam trying to change character  to numeric but have probelm
>
> mydata <- read.table(header=TRUE, text=', sep=" "
>       id  sex
>        1  NA
>        2  NA
>        3  M
>        4  F
>        5  M
>        6  F
>        7  F
>         ')
>
> if sex is missing then sex=0;
> if sex is"M" then sex=1;
> if sex is"F" then sex=2;
>
> Any help please ?

sex <- c(NA,NA,"M","F","M","F","F")

# 1.
match(sex,c(NA,"M","F"))-1

# 2.
as.numeric(factor(sex,exclude=NULL,levels=c(NA,"M","F")))-1

cheers,

Rolf Turner

P. S. As others have told you, converting character to numeric is highly 
ill-advised.

R. T.

-- 
Technical Editor ANZJS
Department of Statistics
University of Auckland
Phone: +64-9-373-7599 ext. 88276