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The tag denotes a variable that APSIM can supply to other APSIM models when requested.For example, Param(“NitrogenCost”) double NCost tells APSIM to look for a parameter called “NitrogenCost” rather than “NCost”. An alias can also be specified for the parameter. This error can be prevented by specifying the Param as optional with a true parameter e.g. If APSIM cannot find the specified parameter, then it will throw a fatal error. When the code is part of a script component, the parameter values will be on the “Properties” tab. APSIM looks for parameters in the XML configuration for this model. Like the Input tag, APSIM will supply a value but only at the beginning of the simulation. The tag denotes that the variable is a parameter.

This error can be prevented by specifying the Input as optional with a true parameter e.g. If APSIM cannot find the specified variable, then it will throw a fatal error. In the example, APSIM will locate a variable called Fertiliser in another model and retrieve its value.

The tag denotes that a value for this variable needs to be supplied by APSIM.

This will help ensure that APSIM is able to locate your class.ĪPSIM relies heavily on reflection tags to analyse the model source code to locate variables and methods. Secondly, ensure that your class is not inside a namespace. Firstly, make sure your class is declared as public. Two things to note when creating your models. It subtracts the cost of fertiliser and irrigation water from this bank balance and adds in income based on simulated yield and grain protein. The above example calculates a simple gross margin based on a bank balance.