[TRNSYS-users] Float error on squaring

[David Bradley]

Henk,
  I tried to reproduce this error in both TRNSYS 15 and TRNSYS 16 using:

EQUATIONS 3
Var1 = TIME
Var2 = 24-TIME
Error = (Var1-Var2)^2

and was not able to get the floating point error that you report. Could you 
please send me an example in which the floating point occurs?
Thanks
   David


At 03:25 2/15/2006, henkwitte wrote:
>Hello,
>
>When I try to calculate in an equation the square of a difference of two 
>variables in TRNSYS 15 like:
>
>(value_var_1 - value_var_2)^2
>
>A floating point error is generated when the difference is or becomes zero.
>
>(value_var_1 - value_var_2) * (value_var_1 - value_var_2) does work 
>without problems
>
>Is this a known problem?
>
>If I just create an static equation with 0^2 it does not generate the 
>error, so it could be an underflow problem on the variables.
>Is there a round or MIN function in the equation of TRNSYS?
>
>Thanks
>
>Henk WItte
>
>
>Groenholland b.v.
>Valschermkade 26
>1059 CD Amsterdam
>The Netherlands
>
>Tel.: +31 (0)20 - 6159050
>Fax:+31 (0)20 - 6177082
>
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>
>http://www.groenholland.nl
>
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