[R] how to change a dataframe with characters to a numeric matrix?

[Jacques VESLOT]

you probably have a dataframe like this :
z <- data.frame(y1=c(1,2,3),y2=c(4,5,6),y3=c(4,"z",5))

you can do :
z <- as.matrix(z)
mode(z) <- "numeric"




zhihua li a ¨¦crit :

> hi netters,
>
> i have a dataframe TEST like this:
>
> Y1 Y2 Y3
> X1 4 7 8
> X2 6 2 Z
> X3 8 0 1
>
> i would like to change it to a numeric matrix, replacing "Z" with NA
>
> Y1 Y2 Y3
> X1 4 7 8
> X2 6 2 NA
> X3 8 0 1
>
> i've tried the function data.matrix but it didn't work. is there any
> easy way to do this?
>
> thanks a lot!
>
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