In help(unit) I read:
The 'data' argument must be a list when the 'unit.length()'
is greater than 1. For example, 'unit(rep(1, 3), c("npc",
"strwidth", "inches"), data=list(NULL, "my string", NULL))'.
In the newest R-versions it is not anymore allowed to let strings
in the data-argument for plain units, otherwise one gets the
following error:
Non-NULL value supplied for plain unit
I have some labels. Between them I wanted to set a distance of 1.5 lines.
(I wanted to use that for a grid.layout for a legend:
The space is for the symbols.)
labels <- c( 'xxxx:', 'a', 'bb', 'ccc', 'dddd', 'eeeee' )
n <- length( labels )
s <- as.list( c( labels[1], rep( labels[-1], each=2 ) ) )
u <- unit( data=s, x=c( 1, rep( c( 1.5, 1 ), n-1 ) ),
units=c( 'strwidth', rep( c( 'lines', 'strwidth' ), n-1 ) ) )
How can I insert the NULL values into the list ``s''?
To fill every second element of s with NULL, I tried:
s[ 2 * ( 1 : length( labels[-1] ) ) ] <- NULL
But this deletes every second element.
The following would work:
s[ 2 * ( 1 : length( labels[-1] ) ) ] <- NA
But unit() does not accept NAs.
Regards - Wolfram
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