Print less than or equal sign in R?

Question

I tried using \\u2264 for the less than or equal sign:

> names(table_A1) <- c(\"x\", \"P(X=x)\", \"P(X\\u2264x)\")
> print(table_A1)


        

Answer 1

colnames(mtcars)[1] <- as.character(expression("P(X\u2264x)"))
head(mtcars[,1:3])
##                   P(X≤x) cyl disp
## Mazda RX4           21.0   6  160
## Mazda RX4 Wag       21.0   6  160
## Datsun 710          22.8   4  108
## Hornet 4 Drive      21.4   6  258
## Hornet Sportabout   18.7   8  360
## Valiant             18.1   6  225

Answer 2

I cannot reproduce this issue:

table_A1 <- read.table(header = FALSE, text = "2  0.562  0.563
3  0.281  0.844
4  0.105  0.949
5  0.035  0.984")
names(table_A1) <- c("x", "P(X=x)", "P(X\u2264x)")
print(table_A1)
#>   x P(X=x) P(X≤x)
#> 1 2  0.562  0.563
#> 2 3  0.281  0.844
#> 3 4  0.105  0.949
#> 4 5  0.035  0.984
# Try @hrbrmstr's way
colnames(mtcars)[1] <- as.character(expression("P(X\u2264x)"))
head(mtcars[,1:3])
#>                   P(X≤x) cyl disp
#> Mazda RX4           21.0   6  160
#> Mazda RX4 Wag       21.0   6  160
#> Datsun 710          22.8   4  108
#> Hornet 4 Drive      21.4   6  258
#> Hornet Sportabout   18.7   8  360
#> Valiant             18.1   6  225
# Works
# Try how you're doing it
colnames(mtcars)[1] <- "P(X\u2264x)"
head(mtcars[,1:3])
#>                   P(X≤x) cyl disp
#> Mazda RX4           21.0   6  160
#> Mazda RX4 Wag       21.0   6  160
#> Datsun 710          22.8   4  108
#> Hornet 4 Drive      21.4   6  258
#> Hornet Sportabout   18.7   8  360
#> Valiant             18.1   6  225
# works

^{Created on 2018-11-08 by the reprex package (v0.2.1)}