POLYFLOW - Syntax of basic CLIPS command for UDF (numbers, add, function, print, etc.)
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What is the syntax of basic commands in CLIPS language, used for defining UDF in POLYFLOW? In particular, how can one define a sum, an exponential? How to print the result of a UDF function for checking purpose? Printing the contents of a variable: (printout t "comment" ?variable crlf) the instruction crlf stands for "carriage return" and is needed. Defining a Bird-Carreau viscosity function of one parameter: (deffunction BirdCarreau (?g) (bind ?R (* 1000. (** (+ 1 (* 0.5 ?g 0.5 ?g)) -0.4))) ?R ) The independent variable (local shear rate) is named ?g, while the result is stored into the variable ?R. The three parameters of the Bird-Carreau viscosity law, eta0, tnat and n, are respectively given by 1000., 0.5 and 0.2. Exponential function: (deffunction exponential (?x) (bind ?y (exp ?x)) ?y )A few useful hints... Instructions are always written within parantheses Real numbers must contain a . (dot) Extended information can be found in chapter 27 of the POLYFLOW User's manual. |
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