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possible bug in equation

Dear reader,

I put the following in my DCK file:

EQUATIONS 2
x = gt( 2, 1)
y = gt( -2, -1)

After execution, this appears in my LST file:

  EQUATIONS   2
     x = gt( 2, 1)
     y = gt( -2, -1)


 ***** ERROR *****        TRNSYS ERROR #  23
 OPERATION ERROR IN EQUATION EVALUATION: CHECK EQUATION

It seems that negative arguments are not allowed. Am I correct?

With kind regards,

Ruut Brandsma
Modelling specialist
Ecofys bv
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