I have the following array in the R:
FC12h FC10d FC6w
-8.44770875 -0.37171750 0
-56.72384575 2.64778150 2.94636550
-3.00214850 2.64778150 -1.57755700
I need some function that causes numbers greater than zero to have a value of 1, less than zero value equal to -1, and when 0 equals 0:
FC12h FC10d FC6w
-1 -1 0
-1 1 1
-1 1 -1
Does anyone know how I can do this?
The easiest way is with the sign function. Simpler can not be:
sign(dados)
# FC12h FC10d FC6w
#1 -1 -1 0
#2 -1 1 1
#3 -1 1 -1
Data.
dados <- read.table(text = "
FC12h FC10d FC6w
-8.44770875 -0.37171750 0
-56.72384575 2.64778150 2.94636550
-3.00214850 2.64778150 -1.57755700
", header = TRUE)
Being dados its array,
ifelse(dados < 0, -1, ifelse(dados > 0, 1, 0) )
will return what you expect.
The ifelse function is testing whether the dados values are negative ( dados < 0 ). If true, -1 will be assigned, otherwise another test is performed. Now we test whether the dados values are positive ( dados > 0 ). If true, we assign the value 1, otherwise it will be equal to 0 .
Indented code, using if and else is:
for(i in 1:nrow(dados)){
for(j in 1:ncol(dados)){
if(dados[i,j] < 0){
dados[i,j] <- -1
} else{
if(dados[i,j] > 0){
dados[i,j] <- 1
} else{
dados[i,j] <- 0
}
}
}
}