Flowlink 5.1 Software Instruction Manual - Isco
Flowlink 5.1 Software Instruction Manual - Isco
Flowlink 5.1 Software Instruction Manual - Isco
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<strong>Isco</strong> <strong>Flowlink</strong> <strong>5.1</strong> ® <strong>Software</strong><br />
Site Window - 4100/4200/6700<br />
equations comprise three conditions, designated here as A, B,<br />
and C for simplicity.<br />
A AND B AND C. This equation is true when all three<br />
conditions are satisfied. When evaluating the equations, the<br />
instrument tests A first. If A is true, the instrument then checks<br />
B to see if it is true. Next, the instrument checks the operator<br />
AND that relates A and B to each other. If both A and B are true,<br />
the result of A AND B is true. Finally, if the result of A AND B is<br />
true, the instrument tests C and compares it to the result of A<br />
AND B. If C is also true, the equation is satisfied.<br />
A AND B OR C. This equation is true when either the result of<br />
A AND B is true or when C is true.<br />
Order of Execution<br />
“From inside out” means that the instrument tests the conditions<br />
grouped within parentheses first to get a result before testing<br />
conditions outside of the parentheses.<br />
The equation A AND B OR C is logically equivalent to the<br />
following equation, (A AND B) OR C which uses parentheses to<br />
group A and B together. They are equivalent because the<br />
instrument evaluates the first two conditions, A AND B, before<br />
the third condition even though the first two conditions are not<br />
grouped with parentheses.<br />
However, when the parentheses are moved so that the equation<br />
becomes A AND (B OR C), the equation’s result could be entirely<br />
different. The instrument evaluates the conditions within the<br />
parentheses first (B OR C), comparing the result with the first<br />
condition, A. Thus, this equation is true when both A and the<br />
result of B OR C is true.<br />
Equations with nested parentheses (nested means parentheses<br />
within parentheses) are a little more complicated, but the “from<br />
inside out” rule still applies. Consider the examples below:<br />
• (A AND (B OR C)) AND D. The instrument evaluates<br />
(B OR C) first, then compares the result to A, to get a<br />
second result. Finally, it compares the second result to D.<br />
• A AND ((B OR C) AND D). The instrument evaluates B<br />
OR C first, then compares the result to D, obtaining a<br />
second result. Next, it compares the second result to A.<br />
To add parentheses to an equation:<br />
1. While viewing the Equation view box, place the text<br />
cursor before the first item in the group.<br />
2. Click on the Open Parenthesis button - “(.”<br />
3. Move the text cursor after the last item in the group.<br />
4. Click on the Close Parenthesis button - “).”<br />
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