ltext( 0, 0, pos=NULL, label="xxxx") gives an error message. The help page of ``ltext'' references to the help page of ``text'' where the default value of pos is set to NULL.
To solve the problem ``ltext'' could be changed:
OLD:
if (!missing(pos))
NEW:
if (!missing(pos) && ! is.null(pos) )
Wolfram
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