2022-02-14 03:22:51 +01:00
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---
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title: dfr melt
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layout: command
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2022-03-04 13:10:09 +01:00
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version: 0.59.1
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2022-02-14 03:22:51 +01:00
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---
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Unpivot a DataFrame from wide to long format
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## Signature
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```> dfr melt --columns --values --variable-name --value-name```
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## Parameters
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- `--columns {table}`: column names for melting
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- `--values {table}`: column names used as value columns
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- `--variable-name {string}`: optional name for variable column
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- `--value-name {string}`: optional name for value column
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## Examples
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melt dataframe
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```shell
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> [[a b c d]; [x 1 4 a] [y 2 5 b] [z 3 6 c]] | dfr to-df | dfr melt -c [b c] -v [a d]
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```
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