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並前往https://stackify.dev/335886-how-to-specify-an-empty-id-vars-vector-when-melting-a-data-table

How to specify an empty id.vars vector when melting a data ...

However, an empty integer or character vector will do the trick: data.table::melt(dt, measure.vars=c('Petal.Length', 'Petal.Width'), id.vars=integer()) ...

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