Rerun Transfrom ColumnTo reevaluate the Formula of a Formula column, one can write
col<<EVAL formula=""></EVAL>
Is there a similar command to re-evaluate a Transform Column?
Eval Formula doesn't seem to work here - Tcol1 still shows a curve with ::scalingFactor=1:

Names Default to Here(1);
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
gb = dt << graph builder();
::scalingFactor= 1;
tC = dt << transform column ("TCol1",Formula( :height * ::scalingFactor ));
gb << variables(X(:height), Y(tC));
::scalingFactor=5;
tC << Eval Formula();
tC2 = dt << transform column ("TCol2",Formula( :height * ::scalingFactor ));
gb << add variable({tC2, Role("Y"), Position(1)});
Automation and ScriptingRe: Rerun Transfrom Columnnobody?
Re: Rerun Transfrom Column<< Reset Transform() maybe

Re: Rerun Transfrom Columnnice 
and how to reference a Transform Column?
... one which was generated from a Graph Builder object?
Re: Rerun Transfrom ColumnWhen the Transform Column is created by telling the data table to do so
col1 = dt << Transform Column ("col1Name", Formula(1/:height));one can take the return value and sore it as a JSL symbol.
Then it's no problem to re-evaluate the formula:
col1<<EVAL formula=""></EVAL>
The actual problem:
If a report (e.g. graph builder) creates a transform column
gb = dt << graph builder();
gb << Transform Column ("col2Name", Formula(1/:height));there is no return value: how to reference a Transform Column?
So, the question is reduced to:
How to update a a Transform Column which was created by a Report.