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Get option value by dollar symbol
# S3 method for GlobalOptionsFun $(x, nm)
the object returned by set_opt or setGlobalOptions.
set_opt
setGlobalOptions
a single option name.
Zuguang Gu <z.gu@dkfz.de>
opt$a is same as opt("a").
opt$a
opt("a")
opt = set_opt(a = 1) opt$a
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