Hello,
I need to convert dataframe from:

ID   T0   T1   T2
A    1     2     3
B    4     5     6
C    7     8     9

to:

ID Variable Value
A       T0       1
A       T1       2
A       T2       3
B       T0       4
B       T1       5
B       T2       6
C       T0       7
C       T1       8
C       T2       9

i tried to use melt cast but it gives me all the time not exactly what I
need.
Thank you.

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