time function

time()

Returns the current simulation time.

**Input**: none

**Result**: numeric (units = day)

**Comment**:

Any model which has exogenous variables (variables that change as a function of time, independently of the behaviour of the model, such as air temperature or rainfall) needs some way of knowing what the current clock time is: i.e. how far the simulation has proceeded. This function provides that information.

This function is not strictly-speaking necessary: you could get exactly the same behaviour by having a single compartment, initialised to zero, with a single flow in, with a constant value of 1. So, after 1 time unit the value of the compartment would be 1, after 12.5 it would be 12.5, and so on. However, the function is provided to avoid cluttering up the model with an extra compartment and flow.

In: Contents >> Working with equations >> Functions >> Built-in functions

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