Flowlink 5.1 Software Instruction Manual - Isco

Isco Flowlink 5.1 ® Software
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equations comprise three conditions, designated here as A, B,
and C for simplicity.
A AND B AND C. This equation is true when all three
conditions are satisfied. When evaluating the equations, the
instrument tests A first. If A is true, the instrument then checks
B to see if it is true. Next, the instrument checks the operator
AND that relates A and B to each other. If both A and B are true,
the result of A AND B is true. Finally, if the result of A AND B is
true, the instrument tests C and compares it to the result of A
AND B. If C is also true, the equation is satisfied.
A AND B OR C. This equation is true when either the result of
A AND B is true or when C is true.
Order of Execution
“From inside out” means that the instrument tests the conditions
grouped within parentheses first to get a result before testing
conditions outside of the parentheses.
The equation A AND B OR C is logically equivalent to the
following equation, (A AND B) OR C which uses parentheses to
group A and B together. They are equivalent because the
instrument evaluates the first two conditions, A AND B, before
the third condition even though the first two conditions are not
grouped with parentheses.
However, when the parentheses are moved so that the equation
becomes A AND (B OR C), the equation’s result could be entirely
different. The instrument evaluates the conditions within the
parentheses first (B OR C), comparing the result with the first
condition, A. Thus, this equation is true when both A and the
result of B OR C is true.
Equations with nested parentheses (nested means parentheses
within parentheses) are a little more complicated, but the “from
inside out” rule still applies. Consider the examples below:
• (A AND (B OR C)) AND D. The instrument evaluates
(B OR C) first, then compares the result to A, to get a
second result. Finally, it compares the second result to D.
• A AND ((B OR C) AND D). The instrument evaluates B
OR C first, then compares the result to D, obtaining a
second result. Next, it compares the second result to A.
To add parentheses to an equation:
1. While viewing the Equation view box, place the text
cursor before the first item in the group.
2. Click on the Open Parenthesis button - “(.”
3. Move the text cursor after the last item in the group.
4. Click on the Close Parenthesis button - “).”
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