Added Pandas Set Index node

docs/reference/node_reference.md

@@ -52,6 +52,10 @@
 | [Pandas Loc Row Series](pandas_loc_row_series.md) | Selects a row from a pandas DataFrame and output as a Series. |
 | [Pandas Select Columns](pandas_select_columns.md) | Selects specific columns from a pandas DataFrame. |
 | [Pandas Select Rows](pandas_select_rows.md) | Selects specific rows from a pandas DataFrame based on a condition. |
+## Data transformation
+| Node | Description |
+| --- | --- |
+| [Pandas Set Index](pandas_set_index.md) | Create index (row label) from existing column or columns. |
 ## Data type conversion
 | Node | Description |
 | --- | --- |

docs/reference/pandas_set_index.md

@@ -0,0 +1,33 @@
+# Pandas Set Index
+Create index (row label) from existing column or columns.
+
+You can specify a single column or a comma-separated list of column labels in `column_names`.  
+If `drop=True`, the specified columns are removed from column labels and become the index.  
+If `drop=False`, the columns remain in the DataFrame column labels while also being used as the index.  
+If `append=True`, the new index is added alongside the existing index.
+
+Below screenshots illustrate these options:
+
+![Pandas Set Index](../images/set_index1.png)
+
+![Pandas Set Index](../images/set_index2.png)
+
+This class internally calls `pandas.DataFrame.set_index()`.
+
+## Input
+| Name | Data type |
+|---|---|
+| dataframe | DataFrame |
+| column_names | String |
+| drop | Boolean |
+| append | Boolean |
+
+## Output
+| Data type |
+|---|
+| DataFrame |
+
+<HR>
+Category: Data transformation
+
+ComfyUI Data Analysis Node Reference. © 2025 Hide Inada (HowToSD.com). All rights reserved.