It seems a lot of things are possible with dynamic variable names. If I have more complicated loops and calculations with dynamic variable names I often 1st rename them to a standard variable name (like “_temp_var”) and make all the calculations and transformations using that and in the end rename the result back to the original name or a changed version of it.
my_variable1 -> _temp_var -> (all the manipulations you want) -> my_variable1_new
The workflow below tries to do some stuff while using the column names as variables.
To use this workflow in KNIME, download it from the below URL and open it in KNIME:
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