matrixknime
How to convert a table in a matrix in KNIME?
Is it possible and if so, how to convert a table to a matrix?
My output table is structured as follows:
rowid user item value
0 x A 10
1 x B 15
2 x C 0
3 y A 12
4 y B 17
5 y C 25
My goal is to create a matrix in the following form:
rowid A B C
x 10 15 0
y 12 17 25
Solution
Use a Pivoting node with the following settings:
Group column(s) user
Pivot column(s) item
Manual Aggregation > Column value
Advanced Settings > Column name: Pivot name
You can leave the Aggregation set to First.
Connect the Pivot table output to a RowID node with settings:
Replace RowID with… checked
New RowID column user
Remove selected column checked
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