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What does this notation mean?

Posted Aug 7, 2012, 8:54 a.m. EDT Low-Frequency Electromagnetics, Parameters, Variables, & Functions Version 4.0, Version 4.0a, Version 4.1, Version 4.2, Version 4.2a, Version 4.3 2 Replies

Martin Hediger
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Dear Comsol users
In the document

www.pksez1.com/Modeling_PIN_Photodiodes.pdf

which describes the simulation of a PIN diode, the author writes in Table 2 for the doping concentration N the expression:

N = NDn + NDnmax*exp( -((y+y1)/ch)^2 ) - NApmax*exp( -( y/ch)^2 )*( (abs(x) < ac/2) + (abs(x) >= ac/2)*exp( -((abs(x)-ac/2)/ch)^2) )

I would like to ask how to read the "conditional part" containing the comparison operations '<' and '>='. These, logically, evaluate to 'true' or 'false', in my world.
What kind of effect do they have here?

Thanks for any hints and advice.

Martin
2 Replies Last Post Aug 7, 2012, 11:15 a.m. EDT
John H.
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Posted: 1 decade ago Aug 7, 2012, 10:15 a.m. EDT
Logical expression that are "true" evaluate to 1, those that are "false" to zero.
Logical expression that are "true" evaluate to 1, those that are "false" to zero.
Martin Hediger
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Posted: 1 decade ago Aug 7, 2012, 11:15 a.m. EDT
I see. Interesting, so i understand it the operators '+' are overloaded in such a context.
I see. Interesting, so i understand it the operators '+' are overloaded in such a context.

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