string - Applying transparency to a vector of colors in plot function -

i trying use alpha conversion col argument in plot function. how do without having write col=alpha(each_color,.5) each_color.

is there way vectorize that?

here reproducible example:

set.seed(10) mydata <- rnorm(100) mycol <-c("#fdf6e3", "#b3e2cd", "#fdcdac", "#cbd5e8", "#f4cae4", "#e6f5c9", "#fff2ae", "#f1e2cc", "#cccccc") par(bg='gray30') plot(mydata,col=mycol,pch=19,cex=3) mycol_alpha <- paste0('alpha(\'',mycol,'\',.5)') par(bg='white') 

is there way apply mycol_alpha plot function directly or other way?

update:

this 1 has solution. mistake, thought alpha function in base r. need library(scales)

solution:

set.seed(10) mydata <- rnorm(100) mycol <-c("#fdf6e3", "#b3e2cd", "#fdcdac", "#cbd5e8", "#f4cae4", "#e6f5c9", "#fff2ae", "#f1e2cc", "#cccccc") par(bg='gray30') plot(mydata,col=scales::alpha(mycol,.5),pch=19,cex=3) 

vectorization not problem noted @robert.

add

transparency<-round(255*0.5) # 50% alpha

and try

mycol_alpha <- paste0(mycol,as.hexmode(transparency))

that should add transparency in plot( ... , col=mycol_alpha , ...)

no need scales::alpha.