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two questions about udf programming

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Old   October 4, 2008, 11:00
Default two questions about udf programming
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Vincent
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hello,first thank you for your attention! i am modeling a water vapor transport between two gas channel though a ployer membrane.the diffusion coefficients of the mixture gas are different in the membrane and in the gas channel.i am thinking about that i can write a udf like this using if-else function:if a<x<b and c<y<d,coefficient=.......;else .....,is that feasible? and another question is that can i use a specie's name instead of its specie index when i define the coefficient of this specie in my udf,because i don't know its index or how to get its index.
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Old   October 5, 2008, 00:24
Default Re: two questions about udf programming
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vincent
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go on........... if a<X<b and c<y<d,coefficicent=.......;else coefficient=...... is this feasible? another question,can i use a specie's name instead of its specie index when i define mass diffusion coefficient because i don't its index or how to get its index,for example,i use water-vapor instead of its index.
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