parameters_add_without_overwriting = function( parameter_list, ... ) {
to_add = list(...)
vns = names( to_add )
n = length( to_add )
for ( i in 1:n) {
if ( !exists(vns[i], parameter_list) ) parameter_list[[vns[i]]] = ...elt(i)
}
return (parameter_list)
}
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