Berkane, Your question is difficult to answer as we don’t know how “fanction “ is defined. Please send the full equation list. But I’ll take a shot at it. ABS returns the absolute value of the argument. So if fanction is 1, the function returns a 0. If fanction is 0, the function returns a 1. Jeff - TESS Sent from my iPhone On May 16, 2018, at 3:49 AM, berkane ahlem via TRNSYS-users <trnsys-users@lists.onebuilding.org> wrote:
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