Let x be a character vector and suppose you want to change all appearances to magenta in vector x by purple. Create a new vector y $($within the function replacemagenta$())$ which is just like x except that magenta is replaced by purple. For example, if

x $=$ c$("$blue$",$ "magenta", "yellow", "green", "cyan", "magenta", "black", "red"$)$

then y should read

y

$[1]$ "blue" "purple" "yellow" "green" "cyan" "purple" "black" "red"